Source note · SIP 488 and codec negotiation failures
SDES a=crypto attributes are defined only for SRTP transports such as RTP/SAVP and RTP/SAVPF, not for plain RTP/AVP.
Checked 2026-09-25
SRTP security descriptions MUST only be used with the SRTP transport (e.g., "RTP/SAVP" or "RTP/SAVPF").
- Vendor
- IETF
- Product
- SDES
- Subsystem
- SRTP keying
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 4568
- Checked
- 2026-09-25
Sources
- RFC 4568: Session Description Protocol (SDP) Security Descriptions for Media Streams — IETF / RFC Editor · tier 1 standards and regulators · Section 6 SRTP Security Descriptions
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-sdes-srtp-only. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-sdes-srtp-only
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-sdes-srtp-only,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-sdes-srtp-only},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-sdes-srtp-only},
note = {Source note sip-488-codec-failures-sdes-srtp-only, checked 2026-09-25}
}