Some further information:
asterisk version: 13.13.1, pjsip (pjproject) 2.5.5


regards,
andre

Am 13.02.2017 um 17:32 schrieb Andre Gronwald:
Hi all,
I have a strange issue, with a some kind complicate architecture...
A router of our internet provider is in front of another bintec rs353j router, at which my freepbx installation is located. However, NAT etc. seems to work fine.
BUT: Something is not working...:
When registering my sip-trunk towards my provider (3 different providers, all behave comparable), everything works at first. Calls are possible. But after some time, when the next REGISTER happens, the answer of my provider is sent towards the wrong port. My freePBX listens on 55060, where the first registration request are answered as they should. in the second registration request wrong ports are used. besides this, Header "Expires" is set to "0" and no "Allows" are listed...
[...]

Any suggestions how to fix this? Or at least any idea what causes this?

regards,
andre


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