Sub-System Number

The SS7 SCCP sub-system number (SSN): what it identifies, the 1-255 value range, and the full table of assigned SSN values and the SCCP user each one denotes.

The Sub-System Number parameter is used to assign a sub-system number to an object within the SS7 SCCP control layer.

Integer values for this parameter are entered into a field.

Allowable values are from 1 to 255.

SSN value	SSN SCCP user	Description
0	Unknown	SSN not known or not used.
1	SCCP management	SCCP management
3	ISUP	ISDN user part
4	OMAP	Operation, Maintenance and Administration Part
5	MAP	Mobile Application Part
6	HLR	Home Location Register (MAP)
7	VLR	Visitor Location Register (MAP)
8	MSC	Mobile Switching Center (MAP)
9	EIR	Equipment Identifier Register (MAP)
10	AUC	Authentication Center
11	ISDN supplementary	ISDN Supplementary services
13	BISDNE2EAPP	Broadband ISDN Edge-to-Edge Application
14	TCTR	TC Test Responder
142	RANAP	Radio Access Network Application Part
143	RNSAP	Radio Network Subsystem Application Part
145	GMLC	Gateway Mobile Location Centre (MAP)
146	CAP	CAMEL application part
147	gsmSCF	Global System for Mobile Service Control Function (MAP)
148	SIWF	Serving GPRS Support Node (MAP)
149	SGSN	Serving GPRS Support Node (MAP)
150	GGSN	Gateway GPRS Support Node (MAP)
249	PCAP	Positioning Calculation Application Part
250	BSC BSSAP	BSC Base Station System Application Part (BSSAP-LE)
251	MSC BSSAP	MSC Base Station System Application Part (BSSAP-LE)
252	SMLC BSSAP	Serving Mobile Location Center (BSSAP-LE)
253	BSSOM	Base Station System Operation & Maintenance (A-interface)
254	BSSAP	Base Station System Application Part (A-interface)