Hi all, I am having some audio quality issues with a provider under sip. The issue I am having is that the audio seems to be acting like a simplex connection. I have tested my setup with a second provider and the audio quality to them is great. Checked network type issues, latency, packet loss, etc. and all seems to be ok. What I did find was a difference in the RTP debugs. Here is a capture from both providers: RTP Debug from Teliax SIP connection w/ good audio: Sent RTP packet to 208.139.204.228:10102 (type 0, seq 9473, ts 135520, len 160) Sent RTP packet to 208.139.204.228:10102 (type 0, seq 9474, ts 135680, len 160) Got RTP packet from 208.139.204.228:10102 (type 0, seq 4467, ts 149600, len 160) Got RTP packet from 208.139.204.228:10102 (type 0, seq 4468, ts 149760, len 160) RTP Debug from MPC connection w/ bad audio: Sent RTP packet to 66.128.8.234:61414 (type 0, seq 3506, ts 51040, len 160) Sent RTP packet to 66.128.8.234:61414 (type 0, seq 3507, ts 51200, len 160) Got RTP packet from 66.128.8.234:61414 (type 0, seq 23701, ts 52480, len 80) Got RTP packet from 66.128.8.234:61414 (type 0, seq 23702, ts 52560, len 80) Got RTP packet from 66.128.8.234:61414 (type 0, seq 23703, ts 52640, len 80) Got RTP packet from 66.128.8.234:61414 (type 0, seq 23704, ts 52720, len 80) Notice that the lengths are different in the MPC packet capture. I am getting two packets from them to every one of mine. I was askied by them to set my packet size to 20ms but do not know where to do that or if it can be done. They also stated that the packet size should be negotiated in the SIP INVITE and 200 OK messages. Can someone point me in the right direction? Even just what to look for here. I am currently running version 1.2.2, but had the same issues with 1.09 and 1.2. Thanks, Robert