Source note · Cisco IP phone registration and TFTP and ITL and CTL
After obtaining its configuration file, the phone attempts to connect to the highest-priority Unified CM node on the list, using TLS when secure and TCP when nonsecure.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco IP Phone 8800 Series
- Subsystem
- Registration
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Checked
- 2026-09-24
Sources
- Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Technical Details — Cisco Systems · tier 2 current vendor documentation · Phone Startup Process, step Contact Cisco Unified Communications Manager
Cite this note
APA
WarmTransfer. (2026, September 24). Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-highest-priority-cm. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-highest-priority-cm
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-highest-priority-cm,
title = {Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-highest-priority-cm},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-highest-priority-cm},
note = {Source note cisco-phone-registration-highest-priority-cm, checked 2026-09-24}
}