I think the problem is the session-timeout is too long and your nat mapping is being deleted.

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)


On Thu, Aug 27, 2009 at 1:11 PM, Dennis <odermann@googlemail.com> wrote:
the pastebin number is 10129



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