[Freeswitch-users] SIP alaw to SIP T.38 gateway

[Weera Suriya]

Hello Steve (Fax god)!
Thanks for your explanation.
4 days ago I installed FS (git version) on my test server. Yesterday I've
received my new SS7 connection. so I was testing & able to receive faxes
(SIP-alaw to SIP-T.38) and I couldn't test send faxes because my Telco
didn't activate outbound calling. my test was success at 30 concurrent
calls/faxes.

Today my telco activate outbound calling and I've updated FS to today's git
version. I did update (git pull && make current) without keeping a backup of
old FS sources. While I was updating I had a same problem like "Update fail
on mod_spandsp" finally I've updated the system. the problem is now I can't
receive or send a fax with today's git version.

My sip log indicates I was using "User-Agent:
FreeSWITCH-mod_sofia/1.0.head-git-28eb6e0 2010-07-21 00-22-24 +0800" and
this version support receive faxes.
Now I'm using "User-Agent: FreeSWITCH-mod_sofia/1.0.head-git-e704f02
2010-07-25 10-10-06 +0200" and this version doesn't allow me to send and
receive faxes.

Please let me know how can I download "2010-07-21" version again. then I
can continue my testing.

Thanks a lot.

Weera Suriya


On Tue, Jul 20, 2010 at 11:45 PM, Steve Underwood <steveu at coppice.org>wrote:

> On 07/20/2010 11:16 PM, Weera Suriya wrote:
> > Hello list,
> > I have a question about t.38 fax gateway feature in FS(mod_spandsp).
> > here is my setup.
> > PSTN <----SS7--->YATE(doesn't support T.38 fax
> >
> gateway)<----IAX2--alaw---->CallWeaver-Faxgateway<------SIP--T.38------->OpenSIPs<------->ATAs(T.38)<---->fax
> > machines
> > I've 16 E1s connected with my Yate server and Yate server send faxes
> > to Callweaver servers (6 servers for CallWeaver) via IAX2(alaw) . then
> > CallWeaver servers send faxes to OpenSIPs server via  SIP T.38 and
> > OpenSIPs server send SIP calls to ATAs
> >
> > Now I want to expand this setup by adding 16 more E1 connections and I
> > want to replace these 6 CallWeaver servers with one or two FreeSwitch
> > :) I would like to know one thing. does FS able to convert SIP alaw
> > fax (or IAX2 alaw fax) into SIP T.38 fax (I know TDM to SIP t.38 works
> > with FS)
> >
> We have T.38 gateway functionality implemented in FS now. At this point
> it should be more robust than Callweaver in its call negotiation logic,
> and the logic in the T.38 engine. However, it has not yet been pushed as
> hard as Callweaver with concurrent channels. The design looks good, but
> we still need to prove no processing spikes, or similar issues, prevent
> the concurrent channels going right up to the limits of the processors.
> If you want to try high volumes with FS we will be grateful for any
> feedback, and I will consider addressing any performance issues you
> might find a priority.
>
> Steve
>
>
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