[Asterisk-Dev] Fax support?

[John Paul Morrison]

On a related note, has anyone looked at passing T.38 through Asterisk?
I've looked at traces between a Multitech T.38 adapter and a Cisco gateway
being proxied/bridged through Asterisk (I have a situation where I can't use
sip reinvite).

The Multitech and Cisco setup OK as a voice codec and then dynamically
negotiate 
over the RTP channel. When Asterisk is in the middle, it sees this and drops
the RTP
on the floor. There are several different places in the code where it checks
and may
drop an unknown RTP codec/payload. This seems pretty inefficient - why not
have a fastpath
if you are just bridging two sessions together? In this case it would also
mean that T.38
should pass through unharmed by Asterisk.


> -----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com 
> [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Thomas
> Sent: Wednesday, September 15, 2004 9:24 AM
> To: Steve Underwood
> Cc: Steve Underwood
> Subject: Re[2]: [Asterisk-Dev] Fax support?
> 
> 
> 
> Saturday, July 10, 2004, 6:21:35 AM, Steve wrote:
> SU> I produced spandsp as the first step towards a T.38 
> facility for *. 
> SU> Right now I am finishing off the next major round of additions to 
> SU> spandsp - its own FAX compression/decompression routines, V.17, 
> SU> modem noise performance improvements, class 1 FAX modem interface 
> SU> for HylaFAX compatibility. When this has stabilised I 
> want to make 
> SU> T.38 work.
> 
> Wow, I just found this earlier post in mailing list.
> Is it possible to try out the new code which has those very 
> desirable features? I would be very happy to be able to try 
> that new stuff.
> 
> Kind regards,
>         Thomas
> 
> ps: is spandsp-0.0.1k the latest version available?
> 
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