Registering Phone on Remote CUCM

[GRANT3779]

Hi All,

If I have Site A with CUCM and Site B with a CUCM (seperate clusters). How can I have a phone on Site A that actually registers with Site B CUCM? I can configure the extension etc.. alog with the MAC on Site B CUCM, but when it goes through DHCP the Option 150 will have Site A address. I don't want to amend the DHCP scope as this will affect all other phones on Site A.

Basically all I want to do is have a phone on Site A that actually registers against Site B's call manager.

Thanks

[Terry Cheema]

You can use a static DHCP scope for this phone. Sample config:

ip dhcp pool STATIC
Network 10.10.10.1 255.255.255.0
Client-id (mac of the phone)
option 150 ip (ip of cucm at site B)

You can also manually set tftp server from phone but if phone restarts phone will again try to register to cucm at site A. With static DHCP even if phone restarts it will always point to site B cucm.

Thanks,
Terry

Sent from Cisco Technical Support iPhone App

[Chris Deren]

You can also look into centelized TFTP option and not worry which TFTP cluster you point to. It is documented in Cisco guides.

HTH,

Chris