Hi
there
I have a
SIP ATA with a fax machine attached and a SIP FXO gateway to the PSTN. When
I try to send faxes in either direction, I get nothing but stony silence. I have
changed the gateway and the ATA to peer to peer mode to test them and they
happily do the T.38 thing and faxes flow.
It seems that they
initially negotiate a G.729 codec, which is what I want and then when the
receiving end detects the fax machine, it wants to re-negotiate and use the
t38fax codec. This is the working the Micronet devices use at
least.
When I put the units
into proxy mode and run them through Asterisk, they fail at the negotiation
stage.
Now I have learned
from my dealings with Asterisk and the newsgroup that Asterisk does not do T.38.
However, why should it not let devices do T.38? My debug messages from Asterisk
don't show it saying no, but the gateways don't wont' setup the T.38 on
Asterisk.
I have chanded
sip.conf to allow=all and there are no explicit rules in the registrations for
the gateways.
Does anyone have an
idea here?
For this venture to
be truly usable, I have to be able to get FAX working at this basic
level.
Regards
Mark
Dutton
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