Source note · SIP early offer and delayed offer
In SIP an initial INVITE may carry an SDP offer in its body but is not required to; an INVITE without an offer is permitted by RFC 3261.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- offer-answer
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261
- Checked
- 2026-09-25
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 13.2.1 Creating the Initial INVITE
Cite this note
APA
WarmTransfer. (2026, September 25). SIP early offer and delayed offer: source note sip-early-delayed-offer-rfc3261-invite-offer-optional. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-rfc3261-invite-offer-optional
BibTeX
@misc{warmtransfer-claim-sip-early-delayed-offer-rfc3261-invite-offer-optional,
title = {SIP early offer and delayed offer: source note sip-early-delayed-offer-rfc3261-invite-offer-optional},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-early-delayed-offer-rfc3261-invite-offer-optional},
note = {Source note sip-early-delayed-offer-rfc3261-invite-offer-optional, checked 2026-09-25}
}