Source note · SIP 488 and codec negotiation failures
An SDP answer must contain exactly the same number of m= lines as the offer, one corresponding to each offered m= line.
Checked 2026-09-25
The answer MUST contain exactly the same number of "m=" lines as the offer.
- Vendor
- IETF
- Product
- SDP offer
- Subsystem
- answer generation
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3264
- Checked
- 2026-09-25
Sources
- RFC 3264 — An Offer/Answer Model with the Session Description Protocol (SDP) — IETF / RFC Editor · tier 1 standards and regulators · Section 6 Generating the Answer
Cite this note
APA
WarmTransfer. (2026, September 25). SIP 488 and codec negotiation failures: source note sip-488-codec-failures-answer-same-mline-count. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-answer-same-mline-count
BibTeX
@misc{warmtransfer-claim-sip-488-codec-failures-answer-same-mline-count,
title = {SIP 488 and codec negotiation failures: source note sip-488-codec-failures-answer-same-mline-count},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-488-codec-failures-answer-same-mline-count},
note = {Source note sip-488-codec-failures-answer-same-mline-count, checked 2026-09-25}
}