350-801 · Question #439
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…
The correct answer is A. 6970 / UDP. Cisco IP phones typically use TFTP (Trivial File Transfer Protocol) for initial configuration files and HTTP for firmware upgrades. For phone firmware upgrades, the HTTP service integrated with the TFTP server in Cisco Unified Communications Manager (CUCM) uses UDP port 6970.
Question
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?
Options
- A6970 / UDP
- B443 / TCP
- C6970 / TCP
- D8080 / TCP
How the community answered
(20 responses)- A85% (17)
- B5% (1)
- C10% (2)
Why each option
Cisco IP phones typically use TFTP (Trivial File Transfer Protocol) for initial configuration files and HTTP for firmware upgrades. For phone firmware upgrades, the HTTP service integrated with the TFTP server in Cisco Unified Communications Manager (CUCM) uses UDP port 6970.
Cisco IP phones use UDP port 6970 for obtaining firmware image files from the HTTP File Server service, which is integrated with the TFTP server on CUCM for phone firmware updates.
TCP port 443 is typically used for HTTPS (secure HTTP), not the HTTP service for phone firmware upgrades in this context.
UDP, not TCP, is the transport protocol used for the specific HTTP File Server that serves phone firmware on port 6970.
TCP port 8080 is a common alternative HTTP port but not the default for Cisco IP phone firmware upgrades from CUCM's integrated service.
Concept tested: Cisco IP Phone firmware upgrade ports/protocols
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/10_0_1/cucm_b_install-guide-1001/cucm_b_install-guide-1001_chapter_0100.html
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