Cisco's troubleshooting guide says the Cisco CallManager service can stop responding when it lacks resources such as CPU or memory, and that CPU utilisation is generally 100 percent at that time.
Checked 2026-10-02
Generally, the CPU utilization in the server is 100 percent at that time.
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- CallManager service
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 12.5(1)
- Checked
- 2026-10-02
Sources
- Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Cisco Unified Communications Manager System Issues — Cisco Systems · tier 2 current vendor documentation · Cisco Unified Communications Manager System Stops Responding
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting high CPU and service crashes in Unified CM: source note cucm-high-cpu-troubleshooting-ccm-stops-responding-cpu. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-high-cpu-troubleshooting-ccm-stops-responding-cpu
BibTeX
@misc{warmtransfer-claim-cucm-high-cpu-troubleshooting-ccm-stops-responding-cpu,
title = {Troubleshooting high CPU and service crashes in Unified CM: source note cucm-high-cpu-troubleshooting-ccm-stops-responding-cpu},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-high-cpu-troubleshooting-ccm-stops-responding-cpu},
note = {Source note cucm-high-cpu-troubleshooting-ccm-stops-responding-cpu, checked 2026-10-02}
}