Source note · Call transfer semantics REFER and Replaces
A SIP transfer has 3 actors: the Transferor initiates the transfer, the Transferee is the party being transferred, and the Transfer Target is the new party being introduced into a call with the Transferee.
Checked 2026-09-16
Transferee: the party being transferred to the Transfer Target. Transferor: the party initiating the transfer. Transfer Target: the new party being introduced into a call with the Transferee.
- Vendor
- IETF
- Product
- Session Initiation Protocol
- Subsystem
- Transfer roles
- Deployment
- not restricted
- Region
- not restricted
- Release range
- BCP 149
- Checked
- 2026-09-16
Sources
- RFC 5589 — Session Initiation Protocol (SIP) Call Control - Transfer — IETF / RFC Editor · tier 1 standards and regulators · RFC 5589 section 2 Actors and Roles
Cite this note
APA
WarmTransfer. (2026, September 16). Call transfer semantics REFER and Replaces: source note xfersem-three-actors. WarmTransfer. https://warmtransfer.net/knowledge/claims/xfersem-three-actors
BibTeX
@misc{warmtransfer-claim-xfersem-three-actors,
title = {Call transfer semantics REFER and Replaces: source note xfersem-three-actors},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/xfersem-three-actors},
note = {Source note xfersem-three-actors, checked 2026-09-16}
}