Phones download firmware and configuration files from Unified CM TFTP over HTTP on TCP 6970 as well as TFTP on UDP 69.
Checked 2026-10-01
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- TFTP
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 15 and SUs
- Checked
- 2026-10-01
Sources
- System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Cisco Unified Communications Manager TCP and UDP Port Usage — Cisco Systems · tier 2 current vendor documentation · Table: Signaling, Media, and Other Communication Between Phones and Cisco Unified Communications Manager, rows UDP 69 and TCP 6970
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tftp-http-port-6970. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tftp-http-port-6970
BibTeX
@misc{warmtransfer-claim-cucm-itl-trust-troubleshooting-tftp-http-port-6970,
title = {Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tftp-http-port-6970},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tftp-http-port-6970},
note = {Source note cucm-itl-trust-troubleshooting-tftp-http-port-6970, checked 2026-10-01}
}