[Freeswitch-users] {Solved} Anyone using t38modem with FS and Hylafax.

[shouldbe q931]

On Fri, Nov 11, 2011 at 9:46 PM, Alex Crow <acrow at integrafin.co.uk> wrote:
> Brian,
>
> I am *not* going out to/in from the world at large from/to the FS box via
> T38. I don't have a T38 capable gateway at the moment, and this is for an
> emergency box to replace a machine with several analog modems attached to
> the Mitel PBX.
>
> Therefore I have to translate t38modem's T38 I/O into audio over SIP to send
> to/rcv from our (non-T38-understanding) Mitel PBX which connects via E1
> trunks to the PSTN.
>
> I know it's not ideal but it does seem to work OK so far.
>
> We have an older fax server (analog lines) where the modem does not support
> ECM. We virtually never have any problems sending or receiving faxes from
> this machine. However if you or anyone else can help get ECM working in this
> setup I'd be happy, but I have my doubts due to the G.711 step between the
> FS machine and the Mitel, probably causing jitter.
>
>
> To clarify, here is the topology:
>
> Hylafax<---Audio---->t38modem<---T38--->Freeswitch/t38gateway<----G.711/SIP--->Mitel
> 3300(T38 unsupported, grr)<---ISDN30---->PSTN
>
> I have to do the transcode as the Mitel is the weak link.
>
> If I could pop an E1 card in the FS box I'm sure things would work a lot
> better, but we don't have a spare card or indeed a spare circuit right now!
>
> Hope this make sense....
>
> Alex
>
>

I would use an analogue or PRI/BRI (depending on volume) card in the
Mitel going to modems/dialogic card(s) in the Hylafax server.

You might also want to look at IAX modem instead of T38