- Subsystem number
Signalling Connection Control Part (SCCP) subsystem numbers are used to identify applications within network entities which use SCCP signalling.GSM and UMTS SSNs
In
Global System for Mobile Communications (GSM) andUniversal Mobile Telecommunications System (UMTS), subsystem numbers may be used betweenPublic land mobile network s (PLMNs), in which case they are taken from the globally standardized range (1 - 31) or the part of the national network range (129 - 150) reserved for GSM/UMTS use between PLMNs. For use within a PLMN, numbers are taken from the part of the national network range (32 - 128 & 151 - 254) not reserved for GSM/UMTS use between PLMNs.The following globally standardised subsystem numbers have been allocated for use by GSM/UMTS:
6 HLR (MAP) 7
VLR (MAP) 8 MSC (MAP) 9EIR (MAP) 10 is allocated for evolution (possible Authentication Centre).The following national network subsystem numbers have been allocated for use within GSM/UMTS networks:
249
PCAP 250BSC (BSSAP-LE) 251 MSC (BSSAP-LE) 252SMLC (BSSAP-LE) 253 BSS O&M (A interface) 254 (A interface)The following national network subsystem numbers have been allocated for use within and between GSM/UMTS networks:
142
RANAP 143 RNSAP 145GMLC (MAP) 146 CAP 147 gsmSCF (MAP) or IM-SSF (MAP) 148 SIWF (MAP) 149SGSN (MAP) 150GGSN (MAP)North American (ANSI) SSNs
232 CNAM (Calling Name) 247 LNP 248 800 number translation (AIN0.1) 254 800 number translation (TCAP)
References
* [http://www.3gpp.org/ftp/tsg_cn/TSG_CN/TSGN_03/Docs/NP-99143.pdf CAP SCCP SSN reallocation] (PDF)
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