Source note · SIP call forwarding and routing loops
Unified CM prevents Call Forward All activation from the phone when the new destination would complete a CFA loop, for example 1000 forwarding to 1001 when 1001, 1002 and 1003 already forward all calls in a chain back to 1000.
Checked 2026-09-25
Unified Communications Manager prevents CFA activation on the phone when a CFA loop is identified.
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- call forwarding
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs
- Checked
- 2026-09-25
Sources
- Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Forwarding — Cisco Systems · tier 2 current vendor documentation · Call Forward All Loop Prevention
Cite this note
APA
WarmTransfer. (2026, September 25). SIP call forwarding and routing loops: source note sip-forwarding-loops-cucm-cfa-loop-prevent. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-cucm-cfa-loop-prevent
BibTeX
@misc{warmtransfer-claim-sip-forwarding-loops-cucm-cfa-loop-prevent,
title = {SIP call forwarding and routing loops: source note sip-forwarding-loops-cucm-cfa-loop-prevent},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-cucm-cfa-loop-prevent},
note = {Source note sip-forwarding-loops-cucm-cfa-loop-prevent, checked 2026-09-25}
}