A Cisco 7925 phone at a client's location is not registering with CUCM. The engineer analyzes a packet capture, sees that the phone receives an IP, and downloads the proper configuration file from…

The correct answer is D. SCCP. The Cisco 7925G is a Skinny (SCCP) phone. The registration sequence for a Cisco IP phone is: DHCP (get IP) → TFTP (download config file) → SCCP registration with CUCM. Since the phone has already received an IP and downloaded its config, the next step is to send SCCP (Skinny…

Wireless Troubleshooting

Question

A Cisco 7925 phone at a client's location is not registering with CUCM. The engineer analyzes a packet capture, sees that the phone receives an IP, and downloads the proper configuration file from TFTP successfully. What type of messages should the phone be sending at this point?

Options

AH.245
BH.323
CMCGP
DSCCP

How the community answered

(39 responses)

A
10% (4)
B
3% (1)
C
5% (2)
D
82% (32)

Explanation

The Cisco 7925G is a Skinny (SCCP) phone. The registration sequence for a Cisco IP phone is: DHCP (get IP) → TFTP (download config file) → SCCP registration with CUCM. Since the phone has already received an IP and downloaded its config, the next step is to send SCCP (Skinny Client Control Protocol) registration messages to the CUCM server listed in that config file. H.323 and H.245 are ITU-standard VoIP protocols not used by Cisco SCCP phones, and MCGP is not a real protocol (MGCP is, but Cisco 7925 phones do not use it).

Topics

#CUCM registration#SCCP#VoIP signaling#Cisco 7925

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