350-801 · Question #566
An engineer is troubleshooting a registration issue where SIP phones fail to register to their Cisco UCM cluster. After an investigation, the engineer discovers that the phones fail to receive an IP…
The correct answer is C. VLAN assignment. Since the engineer has already validated physical connectivity, DHCP configuration, and Cisco UCM settings, the next logical step is to check the VLAN assignment. In Cisco IP telephony deployments, IP phones often receive their VLAN assignment through CDP (Cisco Discovery…
Question
An engineer is troubleshooting a registration issue where SIP phones fail to register to their Cisco UCM cluster. After an investigation, the engineer discovers that the phones fail to receive an IP address. The engineer already validated that these components were working:
- Physical connectivity
- DHCP configuration
- Cisco UCM configuration
What must be validated next to resolve the issue?
Options
- Aoption 150 setting
- BDHCP configuration
- CVLAN assignment
- DTFTP configuration
How the community answered
(23 responses)- A4% (1)
- B17% (4)
- C70% (16)
- D9% (2)
Explanation
Since the engineer has already validated physical connectivity, DHCP configuration, and Cisco UCM settings, the next logical step is to check the VLAN assignment. In Cisco IP telephony deployments, IP phones often receive their VLAN assignment through CDP (Cisco Discovery Protocol) or LLDP-MED (Link Layer Discovery Protocol - Media Endpoint Discovery). If the phones are in the wrong VLAN or do not receive the proper voice VLAN assignment, they will not get an IP address from the DHCP server, leading to registration failure.
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