210-060 · Question #259
What is the unique identifier that is used to register an IP phone endpoint to Cisco Unified Communications Manager?
The correct answer is A. MAC address. CUCM uses the MAC address as the unique identifier to register and distinguish individual IP phone endpoints.
Question
What is the unique identifier that is used to register an IP phone endpoint to Cisco Unified Communications Manager?
Options
- AMAC address
- Bmodel
- CIP address
- Dserial number
How the community answered
(29 responses)- A93% (27)
- B3% (1)
- D3% (1)
Why each option
CUCM uses the MAC address as the unique identifier to register and distinguish individual IP phone endpoints.
CUCM identifies each IP phone endpoint by its MAC address, which is globally unique per device. When a phone registers, CUCM matches the MAC address to a device configuration record, and the device name in CUCM is typically formatted as SEP followed by the 12-digit MAC address. This guarantees each phone has an unambiguous identity regardless of its IP address or physical location.
The phone model identifies the hardware type but is not unique - multiple phones share the same model designation.
IP addresses are dynamically assigned and can change, making them unsuitable as a stable unique identifier for endpoint registration.
Serial numbers are not used by CUCM as the registration identifier for IP phone endpoints.
Concept tested: CUCM IP phone endpoint unique identifier for registration
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/adminGuide/cucm_b_administration-guide-1251/cucm_b_administration-guide-1251_chapter_0100111.html
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