kevin.larsen at pionee...
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 Posted: Wed Mar 30, 2016 10:16 am Post subject: [asterisk-users] Is possible to use FXO Digium card like a F |
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| Quote: | There are also cheap USB fax modems that you can attach to an FXO
port and that works fine. All you have to do then is configure
asterisk to detect incoming faxes and route them to that port
(faxdetect=yes?).
This worked great for me when I had all my incoming calls coming
over a Century Link POTS line. As I approach retirement and want to
save money, I switched from the $44/month POTS line to a pennies-
per-month VOIP service via IAX registration. So now I'm wondering
whether this setup would still work. The question undoubtedly shows
my ignorance of telephony stuff. I'm willing to do my homework, I
just want to know if it's even possible to do this, or if there are
better ways to handle fax over VOIP.
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I am going to say this with tongue only partially in cheek. The better way to do fax over VOIP is not to do it. It is finicky and unless you have a real need for it, it isn't worth the time it takes to make it all work. Even working, you still have complaints every time a fax fails to send or receive as people somehow have this expectation that faxes should never fail. To quote the movie War Games, "The only winning move is not to play."
It would be preferable to use a scanner and email to send documents if at all possible. If you still need the occasional fax, I would recommend using a fax service and letting that be someone else's headache.
That said, my company still has plenty of people who insist that faxes are the greatest thing since sliced bread, so I get the fun of supporting them. Your options, depending on scale are to use one the solutions you can integrate right into the Asterisk server or to use an external package and then you just forward the calls from your asterisk box over to your fax software (this is the one I use).
Make sure that your SIP/IAX provider supports T.38 faxing (specifically transcoding) as this will make your life much easier. You have to be careful here as many providers will happily pass T.38 along if it comes in that way, but if someone with an analog line/fax setup sends you a fax, it will hit their system as audio and pass on to you as audio, which with SIP can be fraught with danger unless you have a really excellent connection to your sip provider. With transcoding, they can convert it as it enters their system to T.38 and then just pass the T.38 to you, which results in greater successes. T.38 passthrough is common, transcoding less so, but it is getting more common as time goes on.
Also, if your provider does not support T.38 transcoding, plan on sticking with ulaw or alaw for faxing. The compressed codecs do not allow the audio signal to pass properly and faxes will not work. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ |
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