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 they interlock, is essential for both design and audit work.
To place SID in the wider telecom-security picture, review 3G, 3GPP, 4G, 5GNR, 6G and ADSL — each entry cross-references back to this page so you can walk the topic in either direction.
Related terms
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.