[Asterisk-Dev] RE: Bounty IAX Fax Tone Detection

[Steve Underwood]

Depends what you consider a great job. The existing FAX tone detector 
used in the chan_zap code can be plugged into any other channel in an 
hour or so. It isn't really a great detector, though. It prettty flaky 
when used in chan_zap. Even if you put a good detector in there, what 
you get isn't that much used. As others have said FAX over VoIP is a 
plug and pray solution. Even using ulaw or Alaw on a LAN, succes or 
failure will depend a lot on the terminal equipment - a lot of 
playout/jitter-buffer algorithm are designed to *always* drop a certain 
percentage of packets. All in all, it hasn't been done before because 
although it is trivially easy, it is worthless.

A pretty easy $1000/hour job, though :-)

Steve


Gene Willingham wrote:

>This bounty has been taken.  Martin Pycko was able to deliver the code and
>It works.  He did a great job.  
>
>Gene
>
>
>Original Message
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 1 Feb 2005 21:03:10 -0500
>From: "Gene Willingham" <gwillingham at telasip.com>
>Subject: [Asterisk-Dev] RE: Bounty IAX Fax Tone Detection
>To: <asterisk-dev at lists.digium.com>
>Message-ID: <20050202020309.343F12FC0DC at lists.digium.com>
>Content-Type: text/plain;	charset="us-ascii"
>
>
>I will settle for T.38 pass through on the SIP channel.  It seems that it
>should be easy enough to support.  T.38 implementation using spandsp will
>most likely work on ZAP channels.  Thereby making Asterisk a T.38 endpoint.
>But this is incomplete because you need SIP to terminate the other endpoint
>or you may have two asterisk boxes and IAX.
>
>I Know of one IAX / SIP provider that already has a Lucent softswitch that
>supports SIP and T.38.  He uses asterisk for authentication.  If I could
>have Asterisk handle a SIP T.38 ATA == Asterisk  ==  Asterisk == Softswitch.
>That would be a practical solution for many.  
>
>Gene   
>
>
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