5i' Recommendation E.214 STRUCTURE OF THE LAND MOBILE GLOBAL TITLE FOR THE SIGNALLING CONNECTION CONTROL PART (SCCP) 1 Introduction In order to permit land mobile stations to roam, there is a need to transfer information, e.g. the mobile station roaming number between Public Land Mobile Networks (PLMNs). This transfer of information can be accomplished by the use of Transaction Capabilities (TC) and the SCCP of Signalling System No. 7. When a land mobile station roams to a foreign PLMN, it regis- ters with a Visited Location Register (VLR) within that PLMN. The only information available to the VLR to address the mobile's Home Location Register (HLR) is its International Mobile Station Identity (IMSI). The purpose of this Recommendation therefore is to define the structure of the mobile global title used in SCCP addressing to the public land mobile service, and to establish the relationship between the mobile global title and the international mobile sta- tion identity as defined in Recommendation E.212. 2 Considerations The considerations which form the basis of the Mobile Global Title (MGT) for the land mobile service are as follows: 2.1 The MGT shall be derived from the international mobile station identity in a simplified manner. 2.2 There could be a number of PLMNs in a country. 2.3 The MGT shall permit the identification of the country as well as the PLMN in which the mobile station is registered. 2.4 The MGT should, as an option, permit the identification of the home location register (HLR) of the mobile station. 2.5 The length of the MGT should be minimized. 2.6 The MGT should enable the fixed network exchanges to util- ize existing routing information in order to identify the PLMN. 2.7 Recommendations E.163, E.164, E.165, E.212 and E.213 are applicable. 3 Global title principles 3.1 Structure of the mobile global title The mobile global title is of variable length and composed of decimal digits arranged in two specific parts. These specific parts are the E.164 and the E.212 part. The E.164 part is used to identify the country and the PLMN, or PLMN and HLR, where the mobile station is registered. To accom- plish this, the E.164 part comprises a Country Code (CC), as defined in Recommendation E.163, and a Network Code (NC) which can be the National Destination Code (NDC), as defined in Recommendation E.164, or the NDC and some additional E.164 digits. The NC would identify the PLMN or HLR within the PLMN. The number of E.164 digits required for identification may vary from network to network, and must be established by bilateral agreement. The E.212 part is used to identify the mobile station or mobile station and HLR and is composed of the mobile station iden- tification number as defined in Recommendation E.212. Figure 1/E.214 shows the structure of the mobile global title. Figure 1/E.214, p. 3.2 Derivation of the mobile global title from the interna- tional mobile station identity (IMSI) The MGT is derived from the IMSI (Recommendation E.212) in the manner shown in Figure 2/E.214. Figure 2/E.214, p. Within the MGT the CC is derived directly from the MCC and the NC is derived either directly from the MNC, or from the MNC and some initial digits of the MSIN. The MSIN is mapped directly into the MGT, up to its maximum length. 3.3 Length of mobile global title The Mobile global title will be of variable length but with a maximum of 15 digits. Therefore, if necessary, the least signifi- cant digits of the MSIN will be omitted in order to conform with the maximum length of the MGT. 3.4 Analysis of the mobile global title In order to permit fixed network nodes to utilize existing resources, digit analysis in the originating country will conform to Recommendation E.164. See also Recommendation E.165. Further analysis beyond this requirement shall be by bilateral agreement. The analysis of the E.212 part of the mobile global title in the destination fixed network is a national matter. Recommendation E.215 TELEPHONE/ISDN NUMBERING PLAN FOR THE MOBILE-SATELLITE SERVICES OF INMARSAT TABLE OF CONTENTS 1 Introduction 1.1 Purpose 1.2 Terminology 1.3 Basic considerations 2 Format of INMARSAT mobile international number 3 Telephone/ISDN country codes for INMARSAT applications 4 Format of INMARSAT mobile number 4.1 General format 4.2 Formats for INMARSAT Standard-A system 4.3 Formats for INMARSAT Standard-B system 4.4 Format for INMARSAT Standard-C system 4.5 Format for INMARSAT aeronautical system 4.6 Future INMARSAT standard systems 5 Digit analysis 6 Presentation of INMARSAT mobile number in directories Annex A - Use of ship station identification for maritime applications of systems operated by INMARSAT. Annex B - Group call numbering scheme for the INMARSAT sys- tem. Annex C - Structure of the on-board identification digits in the INMARSAT numbering plan. 1 Introduction 1.1 Purpose The purpose of this Recommendation is to specify a telephone/ISDN numbering plan for mobile earth stations in systems operated by the International Maritime Satellite Organization (INMARSAT). Such systems may include maritime and aeronautical satellite systems. In the future the range of mobile satellite sys- tems may also include satellite systems for other applications. 1.2 Terminology The telex numbering plan for INMARSAT is contained in Recommendation F.125. Recommendations E.215 and F.125 are designed to be as similar as possible. The following terms are used in this Recommendation. 1.2.1 ship station identity As defined in the Radio Regulations, Appendix 43. See also Recommendation E.210. 1.2.2 INMARSAT mobile international number The number following the international prefix which identifies terminal equipment connected to an INMARSAT mobile earth station for access from a public network. 1.2.3 INMARSAT mobile number The part of the INMARSAT mobile international number which follows a country code allocated to the INMARSAT system. 1.2.4 Other definitions For definition of terms such as maritime mobile-satellite ser- vice, aeronautical mobile-satellite service, ship earth station, etc., see the Radio Regulations. 1.2.5 On-board identification digits These digits are the part of the mobile earth station number used for identifying: - a specific terminal equipment on board; - a specific mobile earth station. 1.3 Basic considerations The considerations which form the basis of the numbering plan are: 1.3.1 that it shall be possible to identify an INMARSAT mobile earth station uniquely from the INMARSAT mobile number ; 1.3.2 that the INMARSAT mobile number should have a format where the same number could be used for access from all types of public networks; 1.3.3 that the number of three-digit country codes required for supporting future INMARSAT requirements should be as few as possible; 1.3.4 that different routings could be used for calls to mobile earth stations designed to different INMARSAT system stan- dards; 1.3.5 that Administrations and INMARSAT could apply different charging and accounting rates to different INMARSAT system stan- dards; 1.3.6 that the numbering plan should provide capacity for on-board identification or direct access to a specific terminal equipment connected to a mobile earth station, e.g. on board a ship; 1.3.7 that the numbering plan should support access to multi-channel mobile earth stations; 1.3.8 that the new mobile earth station numbering plan should incorporate numbering plan(s) already in use for the INMARSAT Standard-A system; 1.3.9 that the length of the INMARSAT mobile international number | should comply with Recommendation E.164 (E.163) and will initially be limited to 12 digits (see also Recommendation E.165); 1.3.10 that, for maritime satellite applications, the ship earth station numbering plan should support access to several ship earth stations in the same ship within one ship station identity ; 1.3.11 that the radio regulations make provision for the allo- cation of additional MIDs for a specific country when necessary. 2 Format of INMARSAT mobile international number The general format of the INMARSAT mobile international number | is: CCC T X1. | | Xk where CCC is a three-digit country code allocated to INMARSAT and T 1 . | | | kis the INMARSAT mobile number . The format of the mobile earth station number is given in S 4. 3 Telephone/ISDN country codes for INMARSAT applications Telephone/ISDN country codes for INMARSAT applications are given in Table 1/E.215. Table 1/E.215 [T1.215], p. 4 Format of INMARSAT mobile number 4.1 General format The general format of the INMARSAT mobile number | is T X1X2. | | Xk where the digit T is used for discrimination between different INMARSAT systems. The formats used for the various INMARSAT systems are defined below. The values of the T digits are summarized in Table 2/E.215. The T digits represent a limited resource and a new T digit should therefore only be allocated when necessary for technical or operational reasons. The CCITT Secretariat would be responsible for co-ordinating the allocation of new T digits with the competent Study Groups. Table 2/E.215 [T2.215], p. 4.2 Formats for INMARSAT Standard-A system 4.2.1 Ordinary calls The number format used for ordinary calls to ship earth sta- tions in the INMARSAT Standard-A system is as follows: 1 X1X2X3X4X5X6(7 digits) where 1 corresponds to the T digit and the digits X1X2X3X4X5X6are allocated to ships by INMARSAT. The length of the INMARSAT mobile number | will be 7 digits, making the length of the INMARSAT mobile international number equal to 10 digits. 4.2.2 Group calls For group calls, the INMARSAT mobile number | takes the fol- lowing format: 0 X1X2X3X4X5X6X7X8(9 digits) where 0 corresponds to the T digit and X1through X8takes values as shown in Annex B. The length of the INMARSAT mobile number | will be 9 digits making the length of the INMARSAT mobile international number equal to 12 digits. 4.2.3 Access to special service terminations on board the ship In order to handle automatic data and facsimile calls in the INMARSAT Standard-A system, the following format is proposed (see also Recommendation E.216): 8 Y 1 X1X2X3X4X5X6(9 digits) where 8 corresponds to the T digit, the digits X1through X6take the same value as in S 4.2.1 and the digit Y determines the service termination. Table 3/E.215 lists the values of digit Y for various applications. Table 3/E.215 [T3.215], p. Note 1 - The INMARSAT mobile international number will then have the following format: CCC 8 Y 1 X1X2X3X4X5X6(12 digits) Note 2 - The digits Y 1, etc. need not be analyzed in the international network for routing or charging purposes. 4.3 Formats for INMARSAT Standard-B system 4.3.1 Ordinary calls For ordinary calls to ship earth stations in the INMARSAT Standard-B system, the format shall be initially: 3 1I2D3X4X5X6Z1Z2(9 digits) where 3 corresponds to the T digit and the digits M1I2D3X4X5X6are the first 6 digits of the ship station identity MIDXXX000 (see Annex A). The digits Z1Z2may be used for identifying terminal equipment connected to a ship earth station, for discriminating between channels of multi-channel ship earth stations and for discriminating between several ship earth stations on the same ship. The length of the INMARSAT mobile number | will be 9 digits, making the length of the INMARSAT mobile international number equal to 12 digits. Special requirements on the allocation of the digits Z1Z2are given in Annex C. The number format: 3 1X2X3X4X5X6Z1Z2(9 digits) where the digit X1may take the values 8 or 9 is reserved for future INMARSAT applications. The length of the INMARSAT mobile number | will be 9 digits making the length of the INMARSAT mobile international number equal to 12 digits. 4.3.2 Group calls For group calls the INMARSAT mobile number takes the following format: 3 0 X1X2X3X4X5X6X7 where the digits 0X1through X7take values as shown in S B.2.3. The length of the INMARSAT mobile number | will be 9 digits making the length of the INMARSAT mobile international number equal to 12 digits. 4.3.3 Future extension of the number The INMARSAT mobile number may be extended to 12 digits when the number capacity of the international network is increased (see Recommendation E.165). This is for further study. Annex C proposes a method by which this expansion can be made in order to allow two number lengths to coexist on the same T digit. 4.4 Format for INMARSAT Standard-C system 4.4.1 Ordinary calls For ordinary calls to ship earth stations in the INMARSAT Standard-C system, the format shall be initially: 4 1I2D3X4X5X6X7X8(9 digits) where 4 corresponds to the T digit and where at least the digits M1I2D3X4X5X6are part of the ship station identity digits X7X8may also be part of the ship station identity or be used for discrimi- nation between several ship earth stations on the same ship. In the latter case, X7X8becomes Z1and Z2and the principle of Annex C should be followed. The number format: 4 1X2X3X4X5X6X7X8(9 digits) where the digit X1takes the values 8 or 9 is reserved for INMARSAT applications. The length of the INMARSAT mobile number will be 9 digits, making the length of the INMARSAT mobile international number equal to 12 digits. 4.4.2 Group calls For group calls, the INMARSAT mobile number takes the follow- ing format: 4 01X2X3X4X5X6X7 where the digits 0X1through X7take values as shown in S B.2.3. The length of the INMARSAT mobile number | will be 9 digits making the length of the INMARSAT mobile international number equal to 12 digits. The group call facilities in the Standard-C system are described in Supplement No. 3 of Fascicle II.4. 4.4.3 Future extension of the number For maritime satellite applications, the INMARSAT mobile numbers used in the INMARSAT Standard-C system may be extended to 12 digits when the numbering capacity of the international network is increased (see Recommendation E.165) in a way similar to those of the Standard-B system (see S 4.3.3). This is for further study. 4.5 Format for INMARSAT aeronautical system The general format of numbers in the INMARASAT aeronautical system is as follows: 5 1X2X3X4X5X6X7X8(9 digits) where 5 corresponds to the T digit. The format of the digits X1through X8is still to be deter- mined. The length of the INMARSAT mobile number | will be 9 digits, making the length of the INMARSAT mobile international number equal to 12 digits. 4.6 Future INMARSAT standard systems T digits should be allocated for each new INMARSAT standard system in the future. If an earlier system is taken out of service, T digits allocated for that system may be reallocated to new sys- tems. If the capacity provided by the T digits of Table 2/E.215 is not sufficient, then further capacity may be made available by using T = 9 followed by an additional digit (U) as follows: 9 U X1X2. | | Xk where the digits X1. | | Xkidentifies the mobile earth station and any extension connected to it. The digit U is used to identify new INMARSAT systems or for technical and operational reasons. The CCITT Secretariat would be responsible for co-ordinating the allocation of new U digits with the competent Study Groups. 5 Digit analysis If different routing and/or accounting applies to different INMARSAT standard systems, then the digits CCCT need to be analyzed at international exchanges. If the routing capacity is increased by using T = 9 (see S 4.6), then the digits CCC9U need to be analyzed. The above requirements on number analysis are in compliance with Recommendations E.164 (E.163). See also Recommendation E.165. The digits Y 1, etc., following CCC 8 (see S 4.2.3) need not be analyzed in the international network for routing or charging purposes. 6 Presentation of INMARSAT mobile numbers in directories 6.1 General INMARSAT mobile numbers | may be published in separate direc- tories or in separate sections of general directories. In directories, only the INMARSAT mobile numbers , as speci- fied in S 4.1, shall be listed. The country code to be used and instruction for the subscribers should be contained in general parts of the directories. The use of digits 8 Y in the format for the INMARSAT Standard-A system in S 4.2.3 should also be explained in the gen- eral parts of the directories. This information should also include indications as to whether or not these numbers are accepted for calls to one or more ocean areas. The subject on directories for mobile satellite services requires further studies. ANNEX A (to Recommendation E.215) Use of ship station identification for maritime applications of systems operated by INMARSAT A1 General Appendix 43 of the Radio Regulations defines an international identification plan for ships participating in the maritime mobile services. The ship station identity consists of nine digits and is composed as follows: M1I2D3X4X5X6X7X8X9 where the digits M1I2D3determine the ship's nationality. For ships participating in systems operated by INMARSAT, the main part of this Recommendation specifies a format of the INMARSAT mobile number as follows: T X1X2. | | Xk The purpose of the digit T is explained in S 4. For maritime applications, the number can be regarded as being composed of three blocks as follows: Table 4/E.215 [T4.215], p. where the digit in block 1 is the digit T, the digits in block 2 are related to the ship station identity as explained below and block 3 contains digits which are used for other purposes (e.g. on-board identification). In some INMARSAT systems, block 3 may be empty. Note 1 - For the INMARSAT Standard-A system, INMARSAT applies a ship numbering plan which is not related to the ship station identification plan of the Radio Regulations. In this numbering plan the digit T takes the fixed value T = 1. Note 2 - For INMARSAT Standard-B and C systems, the digit X1may take either of the values 8 or 9 for future applications. In this case, the digits in block 2 are not related to the ship sta- tion identification plan. A.2 Constraints on ship station identification and number- ing A.2.1 The present number capacity of the PSTN requires that the INMARSAT mobile number consist of 9 or fewer digits. When the number capacity of the PSTN/ISDN is increased to 15 digits, then the INMARSAT mobile number can consist of up to 12 digits. Since the same INMARSAT mobile number should be used for telex and data transmission services, further constraints may be put on the number length. A.2.2 The new numbering plan must cater for capabilities as follows: - provision of a reasonable on-board identification capacity for calls to ship board terminal equipment connected to the ship earth station; - possibility of several ship earth stations on the same ship where all ship earth stations have a number associated with the unique ship station identity of the ship; - capability of supporting multi-channel ship earth stations. These capabilities may require digits in block 3 of the INMAR- SAT mobile number , thus reducing the available space for block 2. A.3 Application of ship station identity A.3.1 Digit capacity in block 2 The INMARSAT Standard-A system can only support 6 digits in block 2 because of the addressing capacity on the radio path. The addressing capacity of INMARSAT Standard-B and C systems on the radio path can cater for up to 9 digits in block 2. However, the limited digit capacity of the terrestrial networks puts the following initial constraints on the number of digits in block 2: - for the INMARSAT Standard-B system, the initial digit capacity in block 2 is 6 digits to allow sufficient capacity in block 3 for supporting the capabilities listed in S A.2.2 above. In the future (see Recommendation E.165) the capacity of block 2 may be extended to 8 or 9 digits; - for the INMARSAT Standard-C system, the initial digital capacity in block 2 is 6 digits to allow sufficient capa- city in block 3 for supporting the possibility of identifying several terminal equipments connected to a ship earth station and of several ship earth stations on the same ship. In the future, the capacity of block 2 may be extended to 7 or more digits. A.3.2 Mapping between the ship station identity and the digits in block 2 The mapping between the ship station identity and the digits in block 2 is shown in Table A-1/E.215. Table A-1/E.215 [T5.215], p. For ship earth stations, the ship station identity is thus derived from the digits in block 2 by adding 0s at the end until the identity consists of 9 digits. In order to distinguish between INMARSAT mobile numbers con- sisting of 9 and 12 digits (if they coexist), the digit x7of the ship station identify (see Recommendation E.210) must take the fixed value 0. This constraint is not valid when only 12 digit numbers exist in the future (see also Annex C). The digit T in block 1 determines the type of ship earth sta- tion and, implicitly, the number of digits in block 2. The rela- tionship is shown in Table A-2/E.215. Further details of the number structure is given in the main part of the Recommendation. A.3.3 Ships equipped with several INMARSAT standard systems The ship station identity for such ships is the one derived from the ship earth station standard having the smallest size of block 2. This applies only if the numbering systems for the ship earth station standards are related to the ship station identifica- tion plan. Table A-2/E.215 [T6.215]. p. ANNEX B (to Recommendation E.215) Group call numbering scheme for the INMARSAT system B.1 Categories for group call services At present, four different categories of group call service have been envisaged within the maritime mobile-satellite service. B.1.1 National group calls The category is defined to address all ships of the same nationality. B.1.2 Fleet group calls This category is defined to address all ships within one fleet. B.1.3 Selected group calls This category is defined to address a number of ships having a community of interest irrespective of nationalities or fleets, and forming a predefined group. B.1.4 Area group calls This category is defined to address all ships of any national- ity located within a predetermined geographical area. B.2 Group call formats B.2.1 The general group call format is TX1X2X3X4X5X6X7X8where the digits TX1X2X3X4X5X6X7X8take the values in S B.2.2 for INMAR- SAT Standard-A and the values in S B.2.3 for other INMARSAT stan- dards. B.2.2 The group call numbering schemes for the INMARSAT Standard-A system will use eight decimal digits X1 | | | X8following the T digit, with T = 0, allocated as follows: M2I3D40506070809 National group call M2I3D4F5F6F7F8F9 Fleet group call 0203S4S5S6S7S8S9 Selected group call 020304A5A6A7A8A9 Area group call where M2 / 0 M2 / 1 F5 / 0 S4 / 0. For T = 1 or 8, the group call number is not valid. B.2.3 For INMARSAT standards other than Standard-A, the format of the digits X1 . | | X8is as follows: 0MID 05060708 National group calls 0MID F5F6F7F8 Fleet group calls 000 S4S5S6S7S8 Selected group calls 0000 A5A6A7A8 Area group calls The T digit takes the value allocated for the particular stan- dard in accordance with Table 2/E.215. Hence, for a fleet group call to a Standard B ship earth sta- tion, the format would be: 3 0 MID F5F6F7F8 and for a fleet group call to a Standard-C ship earth station, the format would be: 4 0 MID F5F6F7F8 B.2.4 The MIDs in national and fleet group numbers are those allocated in Table 1 of Appendix 43, Radio Regulations [1]. B.2.5 In accordance with S 4 of the above-mentioned Appendix, the particular MID reflects only the country allocating the group call identity and therefore does not prevent group calls to fleets containing more than one ship nationality. Allocation of selected group numbers should be avoided when the same group could equally well be assigned a fleet group number. B.2.6 National group numbers and fleet group numbers should be allocated by countries. Selected group numbers and area group numbers as applicable to the INMARSAT system should be allocated by INMARSAT; allocation of such numbers may require cooperation with other organizations. B.2.7 A country having assigned a national group or fleet group number should notify the Director-General of INMARSAT if those numbers are going to be used within the INMARSAT system. ANNEX C (to Recommendation E.215) Structure of the on-board identification digits in the INMARSAT numbering plan C.1 Introduction Within the numbering scheme, two digits Z1Z2have been allo- cated (see SS 4.3.1 and 4.4.1) to on-board identification. The pur- pose of these digits is to provide means for identifying different ship earth stations on the same ship, and different instruments, e.g. telephone instrument and a facsimile machine, connected to the same ship earth station. Also, the present length of the INMARSAT mobile international number | s limited to 12 digits. After 1996 it will be possible to increase the number length to 15 digits (see Recommendation E.165). It is considered that the above aspects can be met by careful selection of the significance and values of Z1Z2. C.2 Proposed structure As outlined earlier, it is necessary for Z1Z2to achieve two identification roles, i.e. station and instrument. It is considered that this can be accomplished by allocating Z1to multi-ship earth station identification and Z2to multi-instrument identification. This structure would permit the uniform allocation of numbers to be achieved and would allow the growth of ship earth stations to be independent of the growth of instruments on any one ship earth station. Further, in order to allow the future expansion of the number- ing length, it is proposed that Z1should never be equal to 0 (zero) and the eighth digit of a 12-digit ship earth station number should always be equal to 0 (zero) as long as these two number lengths coexist for the same value of T digit. i.e.: T MID XXXZ1Z2 (9 digits with Z1/ 0) T MID XXX0XXZ1Z2 (12 digits) The above approach would then allow the unambiguous identifi- cation of 9-digit and 12-digit ship earth station numbers on the same T digit. Note - The above constraint on the eighth digit is not required in the future when only 12 digit numbers exist in the INMARSAT system. C.3 Allocation Therefore, from the above, a ship with one ship earth station and one instrument Z1Z2would equal 10. If another instrument were added, then Z1Z2would equal 11 for this instrument. If a ship had two earth stations of the same standard and one instrument attached to each, then the values of Z1Z2would be 10 for one station, and 20 for the second station. If a second instrument were added to the second station, then the value of Z1Z2would be 21 for this instrument. Should it be necessary to allocate more than ten instruments per ship earth station, then another value of Z1would be allocated to the earth station, e.g. for the tenth instrument Z1Z2would be equal to 19 and for the eleventh instrument 20 would be allocated or the next free value Z1. Table C-1/E.215 gives some illustrations of the above alloca- tions. Blanc Table C-1/E.215 [T7.215], p. Reference [1] Radio Regulations , Appendix 43, ITU, Geneva, 1982, revised in 1985, 1986 and 1988. Recommendation E.216 SELECTION PROCEDURES FOR THE INMARSAT MOBILE-SATELLITE TELEPHONE AND ISDN SERVICES 1 Introduction 1.1 Purpose The purpose of this Recommendation is to standardize: a) the selection procedures for subscribers in the public switched telephone network or ISDN calling a ship earth sta- tion in the INMARSAT systems; b) the procedures for calling a subscriber, an operator or a special service termination in the public switched telephone network or ISDN from a ship earth station. This Recommendation applies to INMARSAT Standard-A, B and C systems. Selection procedures for the INMARSAT Aeronautical sys- tem is for further study. 1.2 Related CCITT Recommendations E.215 (Numbering plan for the mobile-satellite ser- vices of INMARSAT). E.210 (Ship identification for VHF/UMF and maritime-mobile satellite services). E.160 (Definitions relating to national and inter- national numbering plans). E.163 (Numbering plan for the international tele- phone service). E.164 (Numbering plans for the ISDN era). E.165 (Timetable for coordinated implementation of the full capability of the Numbering Plan for the ISDN era (Recommendation E.164)). E.171 (International telephone routing plan). E.172 (Call routing in the ISDN era). Q.1101 (General principles for interworking between INMARSAT Standard-A system and the telephone network). Q.1112 (Procedures for interworking between INMAR- SAT Standard-B system and the international public networks). F.125 (Telex numbering plan for the mobile-satellite service of INMARSAT). F.126 (Selection procedures for INMARSAT mobile-satellite telex service). F.127 (Operational procedures for interworking between the telex service and the service offered by INMARSAT Standard-C). 2 Number structures 2.1 Maritime mobile-satellite services are international in nature and international procedures will be adopted to provide access to these services. For some purposes, a maritime mobile-satellite system can be regarded as analogous to a national network and the ship earth stations as subscribers within that net- work. For automatic shore-originated calls, international selection procedures will be adopted using an international prefix number, the three digit country code 87S and a mobile earth station number where the digit S indicates the ocean region. The telephone/ISDN numbering plan for ship earth stations in the INMARSAT System is given in Recommendation E.215. 2.2 For automatic ship-originated calls international selec- tion procedures will be used, including a stan dardized prefix, i.e. all ships in all ocean areas will use the same prefix to iden- tify an automatic international call. In addition, prefixes will be adopted to identify other func- tions for the satellite system. Annex A lists the allocation of the prefixes. Additional prefixes may be required and these can be added, using the spare decimal numeric combinations. It is desirable to have one set of prefixes for all services. The prefixes listed in Annex A can be used where applicable for telex and data services and, if necessary, additional prefixes for these services may be assigned by the competent Study Group. Close cooperation between the competent Study Groups will be necessary when assigning new prefixes. The use of some prefixes could be barred to some customers. 2.3 The prefixes will be sent over the radio path to the coast earth station but would not be used outside the satellite system. Hence, a prefix sent to the coast earth station would not be used in the international network. 2.4 The service associated with each prefix is defined in Annex B. 3 Procedures for shore-to-ship calls 3.1 General selection sequence A shore based subscriber calling a ship in the INMARSAT system will select a numbering sequence as follows: Pi International prefix 87S Country code TX1X2 | | | | n INMARSAT mobile number . 3.2 Selection of S digit The numbering sequence requires the subscriber to know the satellite coverage area in which the ship is located. The values of the S digit are given in Recommendation E.215. 3.3 INMARSAT mobile number The INMARSAT mobile number TX1X2 | | | | ntakes one of the formats defined in Recommendation E.215. The various possibilities are summarized in Table 1/E.216 and are further outlined below. Table 1/E.216 [T1.216], p. 3.3.1 INMARSAT Standard-A system For an ordinary call to an INMARSAT Standard-A ship earth sta- tion the formats of the INMARSAT mobile number is: 1 X1X2X3X4X5X6 where the digits X1X2X3X4X5X6identify a specific ship earth sta- tion. If there is more than one ship earth station at the ship, each will have its own unique INMARSAT mobile number . Identification of different terminal equipment connected to a ship earth station is not possible in the INMARSAT Standard-A sys- tem. However, provisions can be made for calls to specific service terminations on the ship, e.g. a facsimile equipment. If signals for providing such information are available within the signalling systems used between the switching centre of call origin (i.e. the local national switching centre) and the coast earth station, they should be automatically inserted by that switching centre. In this case the numbering sequence would be as defined above, irrespective of the service termination on the ship. If some part of the connec- tion does not have this capability, the required termination may be indicated by the following numbering sequence: Pi International prefix 87S Country code 8Y Service termination 1 X1X2X3X4X5X6 INMARSAT mobile number . Values of the digit Y for the various service terminations are given in Table 3/E.215. Y = 1 is allocated to the facsimile service and Y = 2 is allocated to packet mode data transmission services using the protocol of Recommendation X.25. Of these, only Y = 1 will be available for selection by telephone subscribers. As other service termination requirements are identified by INMARSAT, the CCITT will make additional allocations. It should be noted that the digits 8Y cannot be used for discrimination between several terminals of the same kind connected to a ship earth sta- tion. It should be further noted that the digits 8Y should not be selected for ordinary telephone calls. 3.3.2 INMARSAT Standard-B system The INMARSAT mobile number | takes the following format for ship earth stations in the INMARSAT Standard-B system: 3 1I2D3X4X5X6Z1Z2 The on board identification digits Z1Z2are used for: - identifying terminal equipment connected to a ship earth station; - discrimination between several ship earth sta- tions on the ship; - discrimination between channels of multi-channel ship earth stations; - combination of the above. See also Annex C to Recommendation E.215. 3.3.3 INMARSAT Standard-C system The INMARSAT mobile number | takes the following format: 4 1I2D3X4X5X6Z1Z2 The digits Z1Z2can be used for on board identification as follows: - identifying terminal equipment connected to a ship earth station; - discrimination between several ship earth sta- tions on the ship; - combination of the above. 3.3.4 INMARSAT Aeronautical system The format of the INMARSAT mobile number , 5 1X2X3X4X5X6X7X8, is still to be determined. 4 Procedures for ship-to-shore calls 4.1 General It should be possible to provide all information required for establishing a call from user terminals connected to the ship earth station. Such information may include: a) called party address including any prefix, b) desired coast earth station, c) selection of a specific RPOA (for further study), d) bearer service/teleservice characteristics, including supplementary service requests. The information in a) is required for all calls. The informa- tion in b), c) and d) may be required on some calls, e.g. if the user requests a specific routing of the call or if specific service characteristics are to be applied. 4.2 Calling a terrestrial subscriber 4.2.1 A shipboard user will select the prefix 00 followed by the full international telephone or ISDN number required, whether or not the coast earth station is located in the called subscriber's country. Hence, the numbering sequence selected by a ship board subscriber will be of the form: 00 Prefix for automatic call 00 I1 I2 I3 1, 2 or 3 digit country code 00I1 I2 I3N1 | | | | n National (significant) number. 4.2.2 It is also possible to select specific services associ- ated with the call by use of other prefixes than 00, e.g. 34 (person-to-person call), 35 (collect call), 36 (credit card call) and 37 (time and charges requested at end of call). The selection sequence will then be: P1P2 Prefix P1P2I1I2I3 1, 2, or 3 digit country code P1P2I1I2I3N1 | | | | n National (significant) number. 4.2.3 The ship earth station will permit the choice of a coast earth station identity through which the call is to be routed. Con- venient land-line routings (e.g. use of the coast earth station nearest the destination country) could be encouraged by tariff con- siderations. 4.2.4 In INMARSAT systems the shipboard user may also select a specified RPOA for routing the call, when a choice between several RPOAs is available at the coast earth station. This selection is provided by information which may not be part of the selection sequence. (For further study.) 4.2.5 In INMARSAT Standard-B systems the user may chose among several service options. If some service characteristics are user selectable, it should be possible to make the selection from the user terminal. Standardization of selection procedures for supple- mentary services is for futher study. 4.3 Calling an operator 4.3.1 A shipboard user will select an operator prefix, the second digit identifying the type of operator required. 4.3.2 Table 2/E.216 illustrates the principle involved for two types of operator. Some Administrations may wish to operate a system whereby shipboard users insert after the operator prefix a country code (I1, I2, 3). The insertion of the country code will allow the call to be routed to a relevant operator. If an Administration operating such a system receives an operator prefix without the optional digits, then the call must still be connected to an appropriate operator. Similarly, if an Administration not operating such a sys- tem receives an operator prefix followed by optional digits, then the optional digits should be ignored and the call connected to the operator denoted by the prefix alone. Table 2/E.216 [T2.216], p. 4.3.3 Each Administration may decide which operators to pro- vide, where they are to be located and how the call would be routed. If a request is received from a ship for a type of operator that the Administration does not provide, then the call will be routed to an operator convenient for that Administration. 4.4 Other prefixes given in Annex A Each Administration may decide which services to provide and how the call would be routed. If a request is received from a ship for a service that the Administration does not provide, then the call will be routed to a location convenient for that Administra- tion. The general selection sequence could be as shown in Table 3/E.216. The actual sequence may be decided by the Administration or INMARSAT. Table 3/E.216 [T3.216], p. 5 Procedures for ship-to-ship calls 5.1 Selection procedures for ship-to-ship calls will be simi- lar to those for ship-to-shore calls, using the maritime country code 87S. The numbering sequence selected by the shipboard user will be of the form: 00 Prefix for automatic call 00 87S Country code 0087S TX1X2 | | | | n INMARSAT mobile number . This format will be used whether or not the ships are in the same ocean area. 5.2 Each Administration operating a coast earth station may decide whether to switch ship-to-ship traffic within an ocean area at the coast earth station or at an international switching centre. 6 Instructions for telephone subscribers The general principles laid down in Recommendation E.120 apply also to the maritime mobile-satellite service. The instructions should contain the full selection procedures with some emphasis put on the selection of the S digit in the country code. 7 Instructions for users at ship earth stations It would be beneficial if coast earth station operators and/or INMARSAT provided user manuals defining the system capabilities and services offered. The manuals should contain information such as: - general instructions for use of the INMARSAT ser- vices; - location of coast earth stations; - facilities provided and services supported by each coast earth station; - selection procedures for setting up automatic calls; - selection procedures for operator assisted calls for each coast earth station; - selection procedures for setting up calls to the services listed in Annex A for each coast earth station; - other instructions which INMARSAT may consider useful or important to users. ANNEX A (to Recommendation E.216) Allocation of telephone prefixes, telex access codes and data transmission prefixes A.1 Administrations should make application for the allocation of new prefixes and access codes to the CCITT Secretariat. The application should contain a definition for the service, termina- tion or facility to be accessed. The CCITT Secretariat would be responsible for coordinating the allocation of new prefixes and access codes with the competent Study Groups. The allocation of new prefixes and access codes should be done in such a way as to ensure that equivalent services carried by means of telephone, telex or data circuits are given the same prefix. The prefixes and access codes to be used for automatic calling should be as follows: Telephone - For international calls the prefix should be 00 followed by the international telephone number of the called subscriber. As an option for national calls the prefix 0 followed by the national (significant) number of the called subscriber could be used. Note - In the maritime satellite service only the inter- national format is preferred. Telex - For international calls the access code should be 00 followed by the international telex number of the called sub- scriber. As an option for national calls the access code should be 0 followed by the national telex number of the called subscriber could be used. Note - In the maritime satellite service only the inter- national format is preferred. Data transmission - For data calls through a public data network the format should always consist of the prefix 0 followed by the international data number of the called subscriber (see Recommendation X.350, S 5.2.1). A.2 Table A-1/E.216 contains a list of prefixes and access codes allocated up to the present time for access to special desti- nations, services or facilities. Table A-1/E.216 [1T4.216], p. Table A-1/E.216 (suite)+ notes [2T4.216], p. A.3 The facilities are defined in Annex B. ANNEX B (to Recommendation E.216) Application of telephone prefixes, data transmission prefixes and telex access codes - Definitions and descriptions Services and facilities normally provided by the telephone data or telex networks are otherwise defined in CCITT Recommenda- tions and do not require any further definitions. This annex pro- vides definitions and descriptions of some of the special facili- ties of Annex A. Note 1 - The same annex is contained in Recommendation F.126. Note 2 - In this annex the term prefix is used to designate telephone prefix, telex access code and data transmission prefix. B.1 Operator B.1.1 international outgoing operator (prefix 11) Prefix 11 will connect the caller to an international operator position. The prefix may be followed by a country code. If so, the procedure for servicing the call is described in S 4.3. B.1.2 international information service (prefix 12) Prefix 12 will connect the caller to the international infor- mation service. The prefix may be followed by a country code. If so, the procedure for servicing the call is described in S 4.3. B.1.3 national operator (prefix 13) Prefix 13 will connect the caller to a national or interna- tional operator position in the country where the coast earth sta- tion is located. The type of operator to be used is decided by the Administration. Note - Prefix 13 may not be offered on all coast earth sta- tions. B.1.4 national information service (prefix 14) Prefix 14 will connect the caller to a national or interna- tional operator position. The type of information service to be used is decided by the Administration. Note - Prefix 14 may not be offered on all coast earth sta- tions. B.1.5 radiotelegram service (prefix 15) Prefix 15 will connect the caller to the radio telegram ser- vice position. The transmission of radio telegram should normally be made by radio telex only. The radio telegram service in this case should be arranged in such a way that automatic retransmission is possible. B.1.6 booking of telephone calls (prefix 17) Prefix 17 will allow the caller to book a telephone call via the telex service. This telex message will be routed to the relevant interna- tional (or national) telephone operator. B.2 Automatic facilities B.2.1 access to maritime PAD (prefix 20) Prefix 20 is used for gaining access to a packet assembly/disassembly (PAD) facility in a packet switched public data network. The PAD is accessed via telephone circuits in the INMARSAT system. The prefix is followed by two additional digits indicating the required data rate (see Recommendation X.351). B.2.2 store-and-forward (international) (prefix 21) Prefix 21 is used for gaining access to a store-and-forward unit (SFU) for international calls. B.2.3 store-and-forward (national) (prefix 22) Prefix 22 is used for gaining access to a store-and-forward unit (SFU) for national calls. B.2.4 abbreviated dialling (short-code selection) (prefix 23) Abbreviated dialling (short-code selection) will allow the caller to make a connection by selecting a short special number (e.g. 2 or 3 digits) instead of a full international (or national) number. B.2.5 telex letter service (prefix 24) Prefix 24 is used for directly transmitting a message ori- ginated from a ship earth station (SES) to a selected telegraph office for delivery by mail or any appropriate means. B.2.6 access to PSPDN (prefix 25) Prefix 25 is used for obtaining access via INMARSAT telephone circuits to a maritime satellite data switching exchange (MSDSE) (see Recommendation X.350) for virtual call data services (Recom- mendation X.25). The prefix is followed by additional digits indi- cating data rate or other parameters associated with the call. B.3 Specialized assistance B.3.1 maritime enquiries (prefix 31) Prefix 31 may be used for special enquiries such as ship loca- tion, authorization, all telegrams, etc. B.3.2 medical advice (prefix 32) Prefix 32 provides connection to national medical facilities (hospital, etc.) for obtaining medical advice or consultation. The prefix may be followed by a country code. B.3.3 technical assistance (prefix 33) For the maritime satellite service, prefix 33 provides connec- tion to the technical personnel of the coast earth station in case difficulties are experienced in establishing communication. For other maritime systems, further study is required. B.3.4 person-to-person call (prefix 34) Prefix 34 should be used when the call is for a specific per- son at the called number. An operator will intervene in the call, and should be provided with the details of the person to be called. The prefix may be followed by the number of the called party. B.3.5 collect calls (prefix 35) Prefix 35 should be used for calls, charges for which will be billed to the called party. The telephone operator will intervene in the call and should be provided with the information pertinent to the call. The prefix may be followed by the number of the called party. B.3.6 credit card calls (prefix 36) Arrangements can be made with the Administration of certain coast stations or coast earth stations for payments for communica- tion services to be made by a credit card. The arrangement is valid only for the services of the station with which it is made. An operator will intervene in the call and should be provided with details of the credit card. The prefix may be followed by the number of the called party. B.3.7 time and charges requested at end of call (prefix 37) Prefix 37 provides, upon completion of the call, either automatic printout of charging information, or connection to an operator who will supply charging information on the call. The pre- fix is followed by the number of the called party. B.3.8 medical assistance (prefix 38) If the condition of an ill or injured person aboard ship requires his urgent delivery ashore or the delivery of a doctor aboard ship, prefix 38 provides connection to the appropriate national authority responsible for this kind of activity. B.3.9 maritime assistance (prefix 39) Prefix 39 provides connection to the appropriate national authority in case maritime assistance is required (e.g. tow, oil pollution). B.4 Ship reporting B.4.1 meteorological reports (prefix 41) Prefix 41 provides connection to the meteorological office for transmission of ship weather reports. B.4.2 navigational reports from ships (prefix 42) Prefix 42 provides connection to a navigational office for transmission of information from ship on any hazards which could endanger safety of navigation (e.g. wrecks, derelicts, floating obstructions, defective radiobeacons or light vessels, icebergs, floating mines, etc.). B.4.3 ship position reports (prefix 43) Prefix 43 provides connection to an appropriate national or international centre collecting ship movement information for search and rescue (or other) purposes. B.5 Information retrieval services (prefixes 5x) Further study is required. B.6 Specialized use Further study is required. B.7 (Reserved for future use.) B.8 (Reserved for future use.) .bp B.9 Test B.9.1 automatic test line (prefix 91) Prefix 91 provides automatic test of the ship earth station in telex and telephony mode. In the maritime satellite service the coast earth station will automatically transmit a "QUICK BROWN FOX" test message for telex and provide a loop-around test line connec- tion in accordance with Recommendation O.11 for telephony. Test lines for data transmission are for further study. B.9.2 commissioning tests (prefix 92) Prefix 92 is used in the maritime satellite service for con- ducting commissioning tests of ship earth stations. B.9.3 operational coordination (prefix 95) Prefix 95 is used in the maritime satellite service for opera- tional communications between management and maintenance elements of the system. Blanc