If you look at your trace the call is sending a re-invite over and over and over again with no reply

you need to examine your network topology and find out why the packets FS is sending to your phone
never make it.

also try disabling session-timers on the snom


On Thu, Aug 27, 2009 at 2:09 PM, Dennis <odermann@googlemail.com> wrote:
> I think the problem is the session-timeout is too long and your nat mapping
> is being deleted.

we changed the param session-timeout (in internal) to 20 and 40,
without success.

we changed the minimum-session-expires to 20, although we knew, the
allowed minimum is 90 and 90 was shown in the console - no success.


> try setting it to a smaller value like 20 or 40 sec
> or try setting those phones to register more frequently (every 10 or 20 sec)

we changed all possible options to 10 and 20, again without success :(



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