As it turns out, the problem is not the Contact Header, it's the multiple Via headers that are the issue. I added &net.sip.via.multple=false to the deploy pattern for them and it solved the problem. The other issue that arose was that there default g.711 packet time is 40ms which Ondo doesn't ...

1. Brekeke Product Name and version:1.5.3.0 2. Java version: 3. OS type and the version: 4. UA (phone), gateway or other hardware/software involved: 5. Select your network pattern from http://www.brekeke-sip.com/bbs/network/networkpatterns.html : 6. Your problem:I need to modify the Contact field in ...