Hello, I just want to send fax over IP using alaw. I also have voice trafic and i want to send voice over gsm and fax over alaw. This is my system. PSTN - PBX - E1 - * --IAX -- * - E1 - PBX -PSTN An i want calls from 1 PSTN to use gsm until second PSTN, and faxes from 1 PSTN to use alaw codec to second PSTN. Diana Cionoiu