Source note · SIP early offer and delayed offer
When the INVITE contained no offer and a reliable provisional response is the first reliable message sent back to the UAC, the offer must appear in that reliable provisional response.
Checked 2026-09-25
If a reliable provisional response is the first reliable message sent back to the UAC, and the INVITE did not contain an offer, one MUST appear in that reliable provisional response.
- Vendor
- IETF
- Product
- SIP
- Subsystem
- offer-answer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3262
- Checked
- 2026-09-25
Sources
- RFC 3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP) — IETF / RFC Editor · tier 1 standards and regulators · Section 5 The Offer/Answer Model and PRACK
Cite this note
APA
WarmTransfer. (2026, September 25). SIP early offer and delayed offer: source note sip-early-delayed-offer-rfc3262-offer-in-reliable-1xx. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-rfc3262-offer-in-reliable-1xx
BibTeX
@misc{warmtransfer-claim-sip-early-delayed-offer-rfc3262-offer-in-reliable-1xx,
title = {SIP early offer and delayed offer: source note sip-early-delayed-offer-rfc3262-offer-in-reliable-1xx},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-rfc3262-offer-in-reliable-1xx},
note = {Source note sip-early-delayed-offer-rfc3262-offer-in-reliable-1xx, checked 2026-09-25}
}