SID (Service Identifier)
SID, the Service Identifier, is a generic term for a number that identifies a particular telecom service or feature within a network or platform. It appears in many standards under different definitions (CDMA system identifier, IMS service identifier, etc.) and should be interpreted in the context of the specification being referenced.
Categories: Protocols and Standards
SID in context
Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how the specs interlock (for example 3GPP TS 33.501 with GSMA FS.34 for 5G SBA security), is essential for both design and audit work.
To place SID in the wider telecom-security picture, review SEAL, CAMEL, ZSM, Segment Routing, SRv6 and Denial of Service (DoS).
Related terms
Related topic hubs
- Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
- VoLTE Security IMS/VoLTE signaling risk: SIP, IMS-AKA, media plane attacks.
- IMS Security Training Training on IMS, VoLTE/VoNR, SIP and RCS security.
- Open RAN Security O-RAN xApp/rApp, E2/A1/O1 interfaces and RIC security.
More from the TelcoSec Glossary
Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.