Hi

I am getting this dreaded error on a asterisk box when call from one UA to another using Asterisk as a media relay and openser as a SBC and proxy.

chan_sip.c:3779 retrans_pkt: Maximum retries exceeded on transmission 1310650592@10.100.0.101

If I make a call from a UA to the PSTN through Asterisk all is fine. This only happens when calling from one UA to another on the same LAN.

I have posted an example sip trace here http://pastebin.com/m2262b0ef

My openser.cfg is here http://pastebin.com/d5e84aaf7

I realise this is a issue with Asterisk but I have not been able to find a fix. Therefore I figure there might be something I can do on openser. The problem seems to be with a ACK not being returned but my SIP knowledge is not good enough to know how to fix it. Any help is greatly appreciated.

Regards

Jon