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SNOM and long calls

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SNOM and PBXnSIP seem to have a compatibility issue.


Here is what we tested:


Short calls (less than 7 mins) allways work fine and the quality is good.


After approx. seven minutes (no matter if calling to external number or receiving a call from a external or internal call extension to extension), audio gets lost and there is only noise on one leg.

We made a ethereal trace and could see that the connection from the PBX to the phone got lost. "Destination unreachable, Port unreachable".


The problem does not occur with Linksys or Polycom phones.


Our setup is:

PBXNSIP (Win32) on Windows 2000SP4.

SNOM 360 and 320 version 6.5.8

Windows 2003R2 Server with DHCP activated



All Connected to a CISCO Catalyst 2950-24 IOS 12.1


A trouble ticket wit SNOM has been opened. I am wondering you can reproduce the problem?

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