On Fri, May 18, 2012 at 2:45 PM, Alex Crow <acrow@integrafin.co.uk> wrote:

On 18/05/12 09:34, Anita Hall wrote:
> Hi Alex
>

> Many thanks for the reply.
>
> Do I need t38modem if I am already receiving the Fax calls over E1 via
> a Sangoma Card in my FS machine ? I read on the list that Hylafax
> takes audio and the only reason you needed t38modem was because your
> FS was getting calls over SIP.
>

Anita,

Yes, you do if you want to use Hylafax and need inbound faxing, because
it needs a modem device. T38Modem provides that (eg /dev/ttyT38x).

> This is my topology
> ~~~~~~~~~
> Hylafax <-------->|______| <-------> FreeSWITCH <---------> E1

Pretty much the same as mine in effect.

So you would need

Hylafax <-------->T38Modem<-------> FreeSWITCH/t38gateway <---------> E1

So hylafax speaks "Fax data" to T38modem, which speaks T38 to
FreeSwitch, which gateways to/from audio over the E1. You may need to
change my configs a bit to get that last bit working, maybe not.

> ~~~~~~~~~
>
> Since Hylafax is already taking audio calls, may be I do not need the
> t38modem ? If not, can Hylafax take audio calls directly from FreeSWITCH ?

Not unless the inbuilt modem can be made to be an endpoint for calls
from coming in from the E1, which I understand at present it cannot.
This is because Hylafax does not send and receive audio itself, it talks
fax control commands to modems and sends and receives data over a serial
port.

>
> This is your topology (taken from your mails in the list)
> ~~~~~~~~~
> Hylafax<---Audio---->t38modem<---T38--->Freeswitch/t38gateway<----G.711/SIP--->Mitel
> 3300(T38 unsupported, grr)<---ISDN30---->PSTN
> ~~~~~~~~~

Actually the Mitel does support T38 with a license. The thing I'm not
sure about is how good its gatewaying to ISDN is.

Cheers

Alex

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