On Friday 12 December 2003 07:25, Dan wrote: > Hi, > > It would be great if the IAX protocol will be able to tranfer fax > data (even converted in another format) between Asterisk boxes, > using low bandwidth codecs like GSM. > I know that this is possible only with the G.711 now (passing faxes > using the audio stream), but.... maybe in the future...some native > support will permit this.
You're not going to get that working because GSM is a lossy codec. It is able to get extreme savings in size, because it optimizes out parts of the sound that most humans don't hear. However, that same bandwidth that humans don't hear is exactly the bandwidth that the fax application uses to transmit valuable portions of the image. Therefore, the GSM codec is never going to be appropriate for sending faxes. Besides, if you need low bitrates for your IP connection, you're likely to experience delays in the fax negotiation -- which will probably result in a failed fax attempt. If you want to be able to send faxes in this way, then negotiate the fax at one end, and email the resulting TIFF to the other end. -Tilghman _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users