Source note · SIP early offer and delayed offer
For an INVITE without SDP, RFC 6337 describes the UAS offer as going in the first reliable 1xx response (answered in PRACK) or, if none, in the final 2xx response, and says the UAS ought not include SDP in other responses to that INVITE.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- offer-answer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 6337 (Informational)
- Checked
- 2026-09-25
Sources
- RFC 6337: Session Initiation Protocol (SIP) Usage of the Offer/Answer Model — IETF / RFC Editor · tier 1 standards and regulators · Section 3.1.2 INVITE Request without SDP
Cite this note
APA
WarmTransfer. (2026, September 25). SIP early offer and delayed offer: source note sip-early-delayed-offer-rfc6337-offerless-invite-offer-location. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-rfc6337-offerless-invite-offer-location
BibTeX
@misc{warmtransfer-claim-sip-early-delayed-offer-rfc6337-offerless-invite-offer-location,
title = {SIP early offer and delayed offer: source note sip-early-delayed-offer-rfc6337-offerless-invite-offer-location},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-rfc6337-offerless-invite-offer-location},
note = {Source note sip-early-delayed-offer-rfc6337-offerless-invite-offer-location, checked 2026-09-25}
}