Source note · Cisco IP phone registration and TFTP and ITL and CTL
For IPv4 endpoints, Cisco recommends DHCP option 150 to give devices the Unified CM TFTP server address; DHCP option 066 or the CiscoCM1 name are documented alternatives.
Checked 2026-09-24
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- TFTP discovery
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Release 15 and SUs
- Checked
- 2026-09-24
Sources
- System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure TFTP Servers — Cisco Systems · tier 2 current vendor documentation · Configure TFTP Servers chapter, TFTP overview (endpoint TFTP server discovery, IPv4)
Cite this note
APA
WarmTransfer. (2026, September 24). Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-opt150-recommended. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-opt150-recommended
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-opt150-recommended,
title = {Cisco IP phone registration and TFTP and ITL and CTL: source note cisco-phone-registration-opt150-recommended},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-opt150-recommended},
note = {Source note cisco-phone-registration-opt150-recommended, checked 2026-09-24}
}