[asterisk-users] Calls being dropped - Cisco 7940 with SIP 8.12 image

[Jonathan Thurman]

On Sat, Oct 3, 2009 at 6:17 AM, James Stocks <stocksy at stocksy.co.uk> wrote:
> Hi everyone,
>
> I hope someone can help me with a problem I'm having with Cisco 7940
> phones on the SIP 8.12 image.  When I place a call from one of the
> handsets, the call proceeds as normal for 20 seconds and is then
> terminated by Asterisk (1.4.26.2):
>

We are runing 08-12-00 on 7940/60s just fine (Asterisk 1.6.1.1), and
have been for a while.

>
> As far as I can tell, the 'a=silenceSupp:off - - - -' header is not
> accepted by the 7940, which seems like a bug in the SIP image to me.
> However, I can't find a way to report this problem to Cisco without a
> support contract (which I do not have).  Reverting to version 7.5
> fixes the problem, but it is still present in 8.11.  The problem is
> not present if the PSTN initiates the call, nor is it present if I
> allow the handsets to reinvite each other.  Here's the sip.conf
> snippet if it helps:
>

That all looks fine to me.  What do your SIPDefault.cnf and
SIP<MAC>.cnf files look like?

-Jonathan