[Asterisk-Users] T.38 fax with SIP devices

[Michael D Schelin]

Hello, The Multitech VOIP line supports T38 and I have tested it. It 
works great.  You will need a public IP to make it work. Very expensive 
though. T38 Is not compatible with Asterisk.


Scott Wolfe wrote:

>I have been on the same path although I am using a TDM400. No matter what I
>did I could not get a fax to go through. Yesterday I moved the * server
>outside my firewall and the rest of the network and now I am making more
>progress. I blame it on old network hardware. I have two accounts, one with
>Broadvoice and the other with LiveVoip. The Broadvoice fax is going through
>with out any problems. LiveVoip faxing still fails. I would like to use
>LiveVoip so I will keep at it.
>-Scott
>
>
>
>----- Original Message ----- 
>From: "Moody" <asterisk.user at gmail.com>
>To: "Asterisk Users Mailing List - Non-Commercial Discussion"
><asterisk-users at lists.digium.com>
>Sent: Thursday, April 07, 2005 7:52 AM
>Subject: Re: [Asterisk-Users] T.38 fax with SIP devices
>
>
>  
>
>>Hello Mark,
>>
>>I have been working on a similar plan but am still looking for
>>reasonable/tested hardware - can you tell me what devices you are
>>using?
>>
>>Thanks,
>>
>>Jonathon
>>
>>
>>On Apr 7, 2005 7:01 AM, Mark Dutton <replies at datamerge.com.au> wrote:
>>    
>>
>>>Hi there
>>>
>>>I have a SIP ATA with a fax machine attached and a SIP FXO gateway to
>>>      
>>>
>the
>  
>
>>>PSTN. When I try to send faxes in either direction, I get nothing but
>>>      
>>>
>stony
>  
>
>>>silence. I have changed the gateway and the ATA to peer to peer mode to
>>>      
>>>
>test
>  
>
>>>them and they happily do the T.38 thing and faxes flow.
>>>
>>>It seems that they initially negotiate a G.729 codec, which is what I
>>>      
>>>
>want
>  
>
>>>and then when the receiving end detects the fax machine, it wants to
>>>re-negotiate and use the t38fax codec. This is the working the Micronet
>>>devices use at least.
>>>
>>>When I put the units into proxy mode and run them through Asterisk, they
>>>fail at the negotiation stage.
>>>
>>>Now I have learned from my dealings with Asterisk and the newsgroup that
>>>Asterisk does not do T.38. However, why should it not let devices do
>>>      
>>>
>T.38?
>  
>
>>>My debug messages from Asterisk don't show it saying no, but the
>>>      
>>>
>gateways
>  
>
>>>don't wont' setup the T.38 on Asterisk.
>>>
>>>I have chanded sip.conf to allow=all and there are no explicit rules in
>>>      
>>>
>the
>  
>
>>>registrations for the gateways.
>>>
>>>Does anyone have an idea here?
>>>
>>>For this venture to be truly usable, I have to be able to get FAX
>>>      
>>>
>working at
>  
>
>>>this basic level.
>>>
>>>Regards
>>>
>>>Mark Dutton
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>>>
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>>>
>>>      
>>>
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>
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