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The saga of fax over VoIP

 
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conurus
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Joined: 15 Aug 2006
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Location: Vancouver, Canada

PostPosted: Wed Oct 29, 2008 3:27 am    Post subject: The saga of fax over VoIP Reply with quote

The codec is supposed to auto-detect fax signals and auto-switch between a voice codec and a fax codec. I set the answering machine to pick up after 6 rings and the fax machine to auto-detect whether the incoming call is voice or fax. The problem is, by that point the codec has already made up its mind that it is a voice call - probably the greeting of the answering machine getting in the way, or after so many seconds (6 rings are a long time) and still no fax tone the codec decided that it is voice.

The VoIP ATA generates 8 distinct ring tones based on caller ID, so I set the fax machine to pick up the incoming call immediately on a certain ring tone, and set up the distinctive ring tone patterns so that any call with caller ID beginning with 0, 2, 3, 6, 7, 9 or no caller ID is a voice call or else it is a fax. I get faxes only from my suppliers and their caller IDs do not start with those digits. The false positives are probably marketing cold calls and I feel good giving them a nice fax tone blast.

Am I nuts? All this trouble for sharing the same VoIP line between voice and fax.

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