By default, IP phones upgrade their images using the HTTP Service from the TFTP Server integrated into one or more of the call processing platforms. Which Port / Transport Protocol does this service use?
"If you want phones to download firmware updates from a server that is not the TFTP server you may configure a “load server” on the phone’s Phone Configuration page. A load server may be another Cisco Unified Communications Manager or a third-party server. A third-party server must be capable of providing any files the phone requests through HTTP on TCP Port 6970 (preferred) or the UDP-based TFTP protocol. Some phone models such as the DX family Cisco TelePresence devices only support HTTP for firmware updates."
Reference: "Administration Guide for Cisco Unified Communications Manager, Release 12.5.1SU1"
The correct answer is 6970/TCP per:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/11_5_1/sysConfig/11_5_1_SU1/cucm_b_system-configuration-guide-1151su1/cucm_b_system-configuration-guide-1151su1_chapter_01010101.html
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