Hi,
I am sure this is not an ooh323 problem, as I can find no reference in
the mail archive, but I am hoping someone can shed some light as I have
spent some time on the Wiki to no avail.
I have a Panasonic PBX with a 16 channel H323 IP gateway card fitted
that is working no problems at all with asterisk and OOH323, except I
cannot get DTMF to pass through from the Panasonic side to the Asterisk.
If I place a call from one analog phone to another on the Panasonic (no
asterisk), DTMF can be heard when keys are pressed, but if both phones
call a Meetme conference, no DTMF is heard.
I have DTMF set to RFC2833 in ooh323.conf and the following are a couple
of lines from /var/log/asterisk/h323:
Enabled RFC2833 DTMF capability for end-point
Enabled RFC2833 DTMF capability for (incoming, ooh323c_1)
However, I am not sure if the Panasonic gateway uses RFC2833. There is a
feature on it which is enabled called "DTMF Detection" about which the
manual states:
"A VoIP network does not guarantee accurate end-to-end transmission of
DTMF signals because the DTMF signals are coded/decoded during VoIP
communications, in the same way as voice signals. In addition, packets
can get lost during transmission. To compensate for this problem, it is
possible to enable DTMF detection for the VoIP Gateway Card to carry out
accurate end-to-end DTMF relay over the network. Upon detecting DTMF
signals from the PBX, the card encodes the signals and then sends them
to the destination, instead of as voice signals. Then at the
destination, the card regenerates the DTMF signals from the received
encoded signals, and then sends them to the PBX. Note that when this
feature is enabled, the sending of packets is delayed by approximately
30 ms. Therefore, it is recommended that you disable this feature unless
DTMF detection is necessary."
This sounds like RFC2833, but perhaps there are other protocols being used.
Any help gratefully received.
Regards,
Richard
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