SIP Digest (SIP Digest Authentication)

SIP Digest is the HTTP-Digest-based authentication scheme (RFC 3261, RFC 7616) used in IMS for fixed and cable access where an ISIM/USIM is unavailable, and defined by TISPAN for NGN. It provides mutual challenge-response using a shared secret but does not by itself protect message integrity or confidentiality; TLS is typically layered underneath.

Categories: SignalingSecurity ControlsProtocols and Standards

SIP Digest in context

Signaling protocols carry the control-plane messages that set up calls, register subscribers and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA as top-tier telecom risk.

Security controls span signaling firewalls (SS7/Diameter/GTP screening), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36.

To place SIP Digest in the wider telecom-security picture, review CAMARA Project, Management Plane, SSL, 1G, 3G and 5G SBA — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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