asterisk users - Mar 2009 - ATA react to phone but unresponsive to fax modem [SOLVED]

2009/3/17 Olivier <oza-4h07 at myamail.com>
>
>
> 2009/3/16 Olivier <oza-4h07 at myamail.com>
>
> Hi,
>>
>> I'm rather new to this domain so I may be doing stupid things
without
>> being concious of that.
>>
>> I've got a Patton MATA I'm trying to setup as T.38 fax adapter.
>> Whenever I connect a fax machine (Dell MFP1815dn) or a phone to it, I
can
>> successfully send a fax or talk to the other end.
>>
>> Whenever I connect a fax modem (Dell Inspiron 6400 laptop), I keep
getting
>> "No signal. Line is busy or disconnect" from Windows XP fax
application.
>> Whatching SIP trafic from this Patton MATA, I can see no single SIP is
>> leaving the box so I'm certain issue relates to analog line
settings but I'm
>> mostly lost with things like Ring Polarity, Ring settings and so on.
>>
>> I tried to mimic settings from an SPA3102 with which I can either fax
from
>> fax machine or fax application but I'm unsuccessful at the moment.
>>
>>
>> 1. Can you explain what is going on ?
>> 2 What would you say reading this :
>> Ring waveform:  trapezoid
>> Ring frequency: 20
>> Ring voltage: 85
>
>
Reducing voltage to 60 made the fax-modem reply.
This is a bit strange as this value is quite different from the one working
with SPA3102.

>> FXS input gain: -6
>> FXS output gain: -6
>> (I copied those values from SPA3102 into MATA)
>
>
>>
>> Best regards
>
>
>
> Changing FXS input gain and FXS output gain from -6 to -12 improved things
> as I could fax out in T.38 with both ATAs and fax endpoints !
>
> But for incoming faxes, modem connected to M-ATA remains silent and idle
> whenever the M-ATA receives a fax call : I can see incoming SIP signal
> arriving into the ATA but it seems no analog signal is going out from it.
> (using SPA3102, faxes are correctly received).
>
>
> How is called the signal an ATA uses when it wants to wake an analog phone
> or a fax machine up ?
> Is it correct to think the same electrical signal is sent whatever the
> analog endpoint is ?
> What could explain a phone is ringing at one and a fax modem remains idle ?
>
> Regards
>
>
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