[cisco-voip] Adding BLF to 7962 causes phone to deregister permanently

[Wes Sisk]

This sounds very much like what happens when you have a transit network 
device doing packet/protocol inspection that does not understand the 
messaging associated with those features.  Is there a NAT boundary, 
firewall doing inspection, or similar network device between this phone 
and the CM server?  Can you move the phone closer to the server to 
confirm it is not a network issue?

Regards,
Wes

On 1/26/2011 7:23 AM, Sechaba Mokoena wrote:
> Hi,
>
> I've got a 7962 with one 7915 expansion module. When I change the 
> phone button template on the phone to include BLFs, the phone 
> deregisters and goes into SRST mode. I also lose Line 1 on the phone. 
> The phone resgisters when the default phone button template is used. 
> I'm using the lastest firmware for the phone and the expansion module. 
> Has anyone encountered a similar problem.
>
> Kind regards,
>
> Sechaba Mokoena
>
>
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