When a new SIP phone is registered to Cisco Unified Communications Manager, it keeps failing and showing an 'unprovisioned' error message in the phone display.
Which problem is a possible cause of this issue?
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A. B. C. D. E.C.
Sure, I can explain each option in detail:
A. Auto-registration is disabled on the Cisco Unified Communications Manager nodes and the phone device does not have a DN configured: If auto-registration is disabled, the phone will not automatically register with the Cisco Unified Communications Manager (CUCM). Without a DN (Directory Number) configured, the phone will not be able to connect to the CUCM and register properly. This can result in the phone displaying an unprovisioned error message.
B. The DN assigned to the phone is already in use by another SIP phone: Each phone in the CUCM must have a unique DN assigned to it. If the DN assigned to the new SIP phone is already in use by another SIP phone, this can cause conflicts and prevent the phone from registering properly. In this case, the phone may display an unprovisioned error message.
C. The phone cannot download and install the latest firmware: If the phone is unable to download and install the latest firmware, it may not be able to communicate properly with the CUCM. This can result in the phone displaying an unprovisioned error message. It is also possible that the phone may display other error messages indicating that it is unable to download or install the firmware.
D. The DHCP settings are set incorrectly and the phone does not have an alternate TFTP defined: If the DHCP settings are set incorrectly, the phone may not be able to connect to the correct TFTP (Trivial File Transfer Protocol) server to download the necessary configuration files. In this case, it is important to check that the correct TFTP server is defined in the DHCP settings. Additionally, if the TFTP server is not available, an alternate TFTP server should be defined in the phone configuration.
E. The DN configuration for this phone is shared with an SCCP phone, which is not supported: It is not possible to share a DN configuration between an SIP phone and an SCCP (Skinny Client Control Protocol) phone. If the DN configuration is shared, this can cause conflicts and prevent the phone from registering properly. In this case, the phone may display an unprovisioned error message.
Therefore, options A, B, C, D, and E are all possible causes of the issue. The specific cause can be determined by troubleshooting and examining the logs on the CUCM and the phone.