Source note · Troubleshooting Cisco IP phone registration
A successful SIP phone registration appears as the phone's REGISTER answered by SIP/2.0 200 OK carrying the contact and an expiry; the tech note's example shows 120 seconds.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- SIP registration
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Troubleshoot IP Phone Unregistration Issues in CUCM — Cisco · tier 2 current vendor documentation · Troubleshoot IP Phone Unregistration Issues in CUCM > SIP registration process
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-sip-200ok. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-sip-200ok
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-sip-200ok,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-sip-200ok},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-sip-200ok},
note = {Source note cisco-phone-registration-troubleshooting-sip-200ok, checked 2026-09-24}
}