Source note · Call transfer semantics REFER and Replaces
Creating a subscription always results in an immediate NOTIFY, and the agent that issued the REFER must be prepared to receive a NOTIFY before the REFER transaction completes.
Checked 2026-09-16
- Vendor
- IETF
- Product
- Session Initiation Protocol
- Subsystem
- REFER
- Deployment
- not restricted
- Region
- not restricted
- Release range
- Standards Track
- Checked
- 2026-09-16
Sources
- RFC 3515 — The Session Initiation Protocol (SIP) Refer Method — IETF / RFC Editor · tier 1 standards and regulators · RFC 3515 section 2.4.4
Cite this note
APA
WarmTransfer. (2026, September 16). Call transfer semantics REFER and Replaces: source note xfersem-refer-immediate-notify. WarmTransfer. https://warmtransfer.net/knowledge/claims/xfersem-refer-immediate-notify
BibTeX
@misc{warmtransfer-claim-xfersem-refer-immediate-notify,
title = {Call transfer semantics REFER and Replaces: source note xfersem-refer-immediate-notify},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/xfersem-refer-immediate-notify},
note = {Source note xfersem-refer-immediate-notify, checked 2026-09-16}
}