TCP 6971 and 6972 are the HTTPS interface to Unified CM TFTP. Phones use them to download secure configuration files.
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, row TCP 6971, 6972
Cite this note
APA
WarmTransfer. (2026, October 1). Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tftp-https-6971-6972. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tftp-https-6971-6972
BibTeX
@misc{warmtransfer-claim-cucm-itl-trust-troubleshooting-tftp-https-6971-6972,
title = {Troubleshooting phone trust and ITL failures in Unified CM: source note cucm-itl-trust-troubleshooting-tftp-https-6971-6972},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-itl-trust-troubleshooting-tftp-https-6971-6972},
note = {Source note cucm-itl-trust-troubleshooting-tftp-https-6971-6972, checked 2026-10-01}
}