Source note · Calls that drop after about 30 seconds
To prove a session-refresh drop, Cisco says to collect SIP logs from both sides and check four things: the refresher role in the initial INVITE, that a re-INVITE or UPDATE goes out before half the interval, that Unified CM relays it to the far side, and that responses come back.
Checked 2026-09-25
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- troubleshooting
- Deployment
- on-premises
- Region
- not restricted
- Release range
- as documented 2015-07-23
- Checked
- 2026-09-25
Sources
- Troubleshoot Call Failures on TC Endpoints Registered to Cisco CallManager — Cisco · tier 2 current vendor documentation · Section 'Problem: SIP Call Drop after 15 Minutes', solution steps
Cite this note
APA
WarmTransfer. (2026, September 25). Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-cucm-refresh-trace-steps. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-cucm-refresh-trace-steps
BibTeX
@misc{warmtransfer-claim-sip-calls-drop-30-seconds-cucm-refresh-trace-steps,
title = {Calls that drop after about 30 seconds: source note sip-calls-drop-30-seconds-cucm-refresh-trace-steps},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-calls-drop-30-seconds-cucm-refresh-trace-steps},
note = {Source note sip-calls-drop-30-seconds-cucm-refresh-trace-steps, checked 2026-09-25}
}