[asterisk-users] FAX with SIP

[Kevin P. Fleming]

On 07/21/2011 04:43 PM, Israel Gottlieb wrote:
>
>
> On Fri, Jul 22, 2011 at 12:39 AM, Kevin P. Fleming <kpfleming at digium.com
> <mailto:kpfleming at digium.com>> wrote:
>
>     On 07/21/2011 04:34 PM, Joaquin Sosa wrote:
>
>         On Mon, Jul 18, 2011 at 07:58, Steve Davies<davies147 at gmail.com
>         <mailto:davies147 at gmail.com>>  wrote:
>
>             The magic sauce that you need is "T.38" - Asterisk 1.6
>             supports this
>             to a limited degree, and your ITSP will need to support it.
>
>             The sip.conf.sample file and the voip-info wiki has all the
>             information you need to try it out.
>
>
>         Correct. However it would be helpful to note T.38 support in
>         Asterisk
>         is broken. Take a T.38 ITSP, T.38 enabled Asterisk and T.38 ATA and
>         try to send a fax. It won't work!
>
>
>     We do this in our testing all the time, and it works fine. Since you
>     didn't specify any particular version of Asterisk, there's no way to
>     associate your "It won't work" statement with anything in
>     particular. Given the variations of T.38 implementations that exist
>     in ATAs, carrier networks and other places, *any* T.38 connection
>     that involves implementations from more than one vendor is
>     (unfortunately) likely to have problems, whether any version of
>     Asterisk is involved or not
>
>
>
> well I tried  a linksys spa 8000 and 2102 thru
> asterisk 1.8.3
> 1.8.4
> 1.6.2.16-19
> sonus switch at itsp (012 israel)
>
> and no luck

We'd be happy to investigate why it failed, if you can capture the 
packet streams on both sides of Asterisk. Frequently, it's a 
configuration issue in at least one of the devices in the system.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org