Re: [hylafax-users] faxing over sip

[Michel R Vaillancourt <mvaillancourt@xxxxxxxxx>]

Quoting Gerard Webb <gedw99@xxxxxxxxxxx>:

> Hey,
>
> I have a sip server for phone calls.
>
> i would like to use hylafax to send and receive faxes this way. The   
> modem page does not mention this aspect at all.   
> http://www.hylafax.org/site1/modems.php
> i know my SIp termination provider can handle faxes, so its just a   
> matter of me being able to send and receive then from my end   
> correctly.
>
> Any hints about if hylafax can do this woudl be good.
>
> Regards
>
> ged

    Hi, Gerard!

    The short version is that you need to use a T.38 gateway at your  
SIP provider, and then a T.38 software to fake a 'modem' interface for  
HylaFAX.  Native TDM faxing over VoIP such as SIP basically either  
doesn't work at all.  Or if it does, you'll see about a 50% failure  
rate if you have a very soild LAN/WAN link to your SIP provider.

    --Michel


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