Fax over IP

Asterisk Asterisk Support
1

Hi, So i am using a TDM410 with a FXS adapter. I currently get the modem signals from my printer fax if I call the extension within my network. but cannot send/receive faxes outside of it. I believe it has something to do with the current codec being used. I would like to switch the extension to g726. If someone could point me in the right direction about changing codecs that would be helpful.

Thanks :mrgreen:

2

You need G.711 to reliable send fax in band. G.726 (ADPCM) might just work, but you may find that it only works at lower transmission speeds.

3

Seems like codecs were not my problem as it was defaulted to ulaw (g711). I get a busy signal when trying to send out a fax. When i call the extension I do hear the modem sounds.