Cisco 2911 DHCP and 3COM NBX Phone system
Posted on 2013-01-21
I have a client that is using a 3COM NBX phone system. We are moving DHCP off of their servers on to their Cisco 2911 and eventually to their ASA. Right now I don't see a DHCP scope for their phones on the windows DHCP server, even though the server's IP address is set as a helper address. This being said, I DO see and DHCP optoin for OPtoin 184, which 3COM phones need. My quesitona are:
1. How do I know if these phones are even using DHCP? When I go into the phone setting on the system's admin console, I see 0.0.0.0 for IP address and Mask, and 255.255.255.255 for manually set IP, mask and GW settings. The NCP IP address is the same as the phone management system. Could this client be using broadcast for VoIP? (Horrible idea if they are).
2. How can I set the option for DHCP option 184 in my Cisco 2911. I have the scope coniferous I just can't figure our that custom option.
Thanks in advance.