Source note · SIP 488 and codec negotiation failures
RFC 3261 defines 488 Not Acceptable Here in section 21.4.26 as a 4xx rejection of the session description offered in the request, scoped to the addressed resource, with 606 Not Acceptable in section 21.6.4 as its global-failure counterpart.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- response codes
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261
- Checked
- 2026-09-25
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 21.4.26 488 Not Acceptable Here; Section 21.6.4 606 Not Acceptable
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-rfc3261-488-defined. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-rfc3261-488-defined
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-rfc3261-488-defined,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-rfc3261-488-defined},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-rfc3261-488-defined},
note = {Source note sip-488-codec-failures-rfc3261-488-defined, checked 2026-09-25}
}