Source note · SDP offer answer and codec negotiation
The answer's direction is constrained by the offer's: a sendonly offer must be answered recvonly or inactive, a recvonly offer sendonly or inactive, an inactive offer inactive, and only a sendrecv offer may be answered with any of the four.
field report · Checked 2026-09-15
If a stream is offered as sendonly, the corresponding stream MUST be marked as recvonly or inactive in the answer.
- Vendor
- IETF
- Product
- SIP
- Subsystem
- SDP offer/answer
- Deployment
- not restricted
- Region
- not restricted
- Release range
- RFC 3264
- Status
- field report
- 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-direction-constrains-the-answer. WarmTransfer. https://warmtransfer.net/knowledge/claims/sdp-oa-direction-constrains-the-answer
BibTeX
@misc{warmtransfer-claim-sdp-oa-direction-constrains-the-answer,
title = {SDP offer answer and codec negotiation: source note sdp-oa-direction-constrains-the-answer},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sdp-oa-direction-constrains-the-answer},
note = {Source note sdp-oa-direction-constrains-the-answer, checked 2026-09-15}
}