Source note · SRST on Cisco IOS XE
A phone engaged in an active call cannot re-establish its connection to the primary Unified CM until that call ends.
Checked 2026-09-25
A Cisco Unified IP phone cannot re-establish a connection with the primary Cisco Unified CM at the central office if it is currently engaged in an active call.
- Vendor
- Cisco
- Product
- Cisco Unified SRST
- Subsystem
- fallback-return
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Cisco Unified SRST Administration Guide (All Versions) - Cisco Unified SRST Feature Overview — Cisco Systems · tier 2 current vendor documentation · Cisco Unified SRST Feature Overview > Cisco Unified IP Phone Fallback (restoration)
Cite this note
APA
WarmTransfer. (2026, September 25). SRST on Cisco IOS XE: source note srst-configuration-active-call-blocks-return. WarmTransfer. https://warmtransfer.net/knowledge/claims/srst-configuration-active-call-blocks-return
BibTeX
@misc{warmtransfer-claim-srst-configuration-active-call-blocks-return,
title = {SRST on Cisco IOS XE: source note srst-configuration-active-call-blocks-return},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/srst-configuration-active-call-blocks-return},
note = {Source note srst-configuration-active-call-blocks-return, checked 2026-09-25}
}