Hi everyone: I have my asterisk 1.0.6 installed on Manrake 10.1. I had problems using ulaw codec, RTT was skyrocketing in few seconds so calls experienced huge delays. Then I started changing my codecs in iax.conf file and monitor the send and receive speed rate from Mandrake Control Center. I have two notices that I need help interpreting please: First, the sending speed and receiving speed rate that I read from Mandrake linux doesn't match what I read about the codec bandwidth. For instance, ulaw (80 kbs) reads 9.3KB/S, gsm (35) reads 3.1KB/S, and ilbc reads 2.7 KB/S. May be I am confused about Mandrake readings. Isn't sending speed and receiving speed are meant bandwidth by Mandrake here? Second, No matter what codec I use , the sending speed is always constant most of the time (0.1 KB/S variation) while the receiving speed suffers bigger variation during the same call and the qulity of the calls suffers as well. So if I used ulaw, I see a sending variation from around 6 kb/s - 9.3 kb/s where the quality is very good at 9.3 KB/S. If I switch to gsm, the receiving speed also varies under 3.1 and where the voice quality is great at 3.1. The internet bandwidth is there, why the codec is not using what it needs? Thanks in avanse for your opinions and suggestions __________________________________ Do you Yahoo!? Plan great trips with Yahoo! Travel: Now over 17,000 guides! http://travel.yahoo.com/p-travelguide