Hi, I have tested G729 and iLBC and both are working even on GPRS Edge networks. Don't forget, that many mobile operators are blocking VoIP. With one operator we had issues on some cells. In many areas his network supported VoIP in some other areas even the registration was not working. And of course don't forget, that the bandwidth is shared (and limited): in one cell you might get very good quality and in another one (or at another time) you might get very poor quality phone calls. Good luck _____ From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Wagner Sent: Monday, September 05, 2011 3:52 AM To: FreeSWITCH Users Help Subject: [Freeswitch-users] Calls over 3G Hello, What's the best way to make calls over 3G networks with less delay and more quality? any kind of compression, or different codec, any ideas? Thanks