2 different phone switchboards, one dhcp

[mustafacelik0123]

Hello,

First of all, I apologize if I have opened the subject in the wrong place.

There are two different telephone switchboards in the institution I work for and they are not Cisco. I made the DHCP configuration via Cisco router and made the following configuration for the first switchboard on DHCP:

option 150 ip 192.168.1.11

My phones are also registered on the second switchboard, but when the communication between the router and the first switchboard goes down, it strains the first switchboard due to the command above. At this stage, I want the command to be changed as follows:

option 150 ip 192.168.2.21

It is not necessary to change, it is enough for my phones to register to the second switchboard. How can I provide this on the router? I looked in many places but I could not find anything like this.

Thanks.

[Maren Mahoney]

Changing the DHCP command would not be enough, I believe, to force the phones to register to the second switchboard. You would also have to force the phones to drop their registration and change it over to the second one. You might be able to script this, with the outage on the router sending a command to stop a service on the first switchboard as one example.

It is difficult to know, though, without more detail. What is the switchboard (the PBX) that the phones are registered to and what version is its software? Are the phones themselves Cisco even if the PBX is not? If not, what kind of phones are they?

DHCP Pools on Cisco routers can have more than one IP address listed. So the command could be option 150 ip 192.168.1.11 192.168.2.21, which would have all phones attempt to register to 1.11 and if 1.11 were not available the phones would try 2.21. But that's as close as I can think of without either scripting or a management application.

Maren