Source note · SDP offer answer and codec negotiation
RFC 3264 recommends that unless there is a specific reason the answerer lists formats in the same relative order as the offer, and gives the reason: it helps assure that the same codec is used in both directions.
Checked 2026-09-15
This helps assure that the same codec is used in both directions.
- Vendor
- IETF
- Product
- SIP
- Subsystem
- SDP offer/answer
- Deployment
- not restricted
- Region
- not restricted
- Release range
- RFC 3264
- Checked
- 2026-09-15
Sources
- RFC 3264 — An Offer/Answer Model with the Session Description Protocol (SDP) — IETF / RFC Editor · tier 1 standards and regulators · RFC 3264 section 6.1 Unicast Streams
Cite this note
APA
WarmTransfer. (2026, September 15). SDP offer answer and codec negotiation: source note sdp-oa-answerer-should-keep-the-offer-order. WarmTransfer. https://warmtransfer.net/knowledge/claims/sdp-oa-answerer-should-keep-the-offer-order
BibTeX
@misc{warmtransfer-claim-sdp-oa-answerer-should-keep-the-offer-order,
title = {SDP offer answer and codec negotiation: source note sdp-oa-answerer-should-keep-the-offer-order},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sdp-oa-answerer-should-keep-the-offer-order},
note = {Source note sdp-oa-answerer-should-keep-the-offer-order, checked 2026-09-15}
}