Again, pardon my ignorance - but I did a basic listening test and notice
that a normal fax machine sends a high pitch tone at the start of a fax
call, whereas TxFax sends a high pitch tone which very quickly gets
interrupted by a lower pitch tone which then repeats about every 1.5s
until hangup. Sometimes you don't even get to hear more than a split
second of the higher pitch tone. What do these tones mean? TxFax's
tones certainly sound different to the normal fax tone I am used to
hearing. I am also struggling to get good debug out of SpanDSP to see
what is behind these tones and what they mean? Can anybody help me in
getting good debug out of the spandsp libraries?
Thanks again,
Ray
Ray Jackson wrote:
Raúl Alexis Betancor Santana wrote:
There are standars thats define that, "how long..", "how much to wait...",
etc, on traditional telephony they was T.30 and company, on VoIP world they
are T.38.
The problems are the same as on traditional telephony, lines with noise (at
the PSTN side I mean), distorsions, delay, etc. There are a lot of problems
to solve, not to mention FAX incompatibilies, compressions schemas, error
corrections codes, etc.
I have seen fax machines on traditional telephony that never talk together
(Cannon and Oki ones for example)
So if you have a problem with FoIP (Fax over IP), try to debug them and let
us ,now so T.38 support on OpenPBX could be improved.
What is the problem you have? OPBX->PSTN->Fax Machine or Fax Machine ->
PSTN -> OPBX
My problem is OPBX->PSTN->Fax Machine, RxFax seems to be working just
fine. In fact I have discovered that if I set the Fax Machine
(recipient) end to 'fax only' mode - the faxes come through just fine.
I only have a problem when the fax machine is in dual (fax/tel) mode,
which suggests a problem in the initial CNG (call setup) stage. The
debugs I have show very little - other than the normal stuff you would
see with a voice call (just g711 alaw negotiation and RTP traffic but no
T.38 switchover/udptl messages at all?).
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