Setup:
POTS phone1 -> Panasonic Analog PBX -> Digium FXO - Asterisk1 - IAX2 -> Asterisk2 - Digium FXS -> POTS phone2
I am attempting to balance the Digium FXO (shown above), analog audio levels using ztmonitor -v, which the information I have found means getting the TX and RX indicators to hit half scale on normal speech.
This results in an RX gain setting of 3.0 and TX gain of 0.0 and levels on both phones sound good to each party.
If however a call is placed as per the flow above and POTS phone2 is not answered, when POTS phone1 is hung up, the FXO on Asterisk 1 is never hung up, due to a failure of busy detect.
Looking at ztmonitor on the FXO, this is because the ringing tone on the TX side is going off the scale and after a few rings, appears on the RX side, overwhelming the congestion tone coming from the Panasonic when POTS phone 1 is hung up. I guess this is caused by the echo canceler being overloaded.
If the RX gain is reduced to 0.0, busydetect works about 80% of the time.
All of this is a long winded way of asking if there is somewhere in the code I can reduce the level of the indications tones (ringing, busy,congestion etc.)?
Given that the TX gain is set to 0.0 and these tones register off the scale, it would seem they are too high.
I am not a coder and some ploughing through indications.c shows mention of "vol" but I am not sure where this can be changed.
Any help would be much appreciated.
Regards,
Richard
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