AT&T vs Verizon DTMF recognition using OBi110 as an FXO Port on Asterisk

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OBiSupport:
The parameters you refer to, such as X_UseFixedDurationRFC2833DTMF and DTMFMethod, are mainly for transmitting DTMF digits from voice services, and they have no effect on FXO DTMF detection. Actually at this point, DTMF detection on LINE port is not configurable.

However, we think the problem might be that the QWEST voip gateway does not pick up digits properly when you have short DTMF tone. OBi does just fine when there is no QWEST voip network involved, so one thing you might try is to use some other standard DTMF testing device, and connect it to your PBX, and see if signals are OK.

otter117:
Thanks,
I have made some progress by setting the Line Port ChannelRxGain to 15
Now, the OBi110 can detect the DTMF with a Droid set to the "normal" DTMF duration setting.
However, it fails on about every 4th call. There may be other factors in the network ( like a bad PRI channel to the PBX ) that is causing this.
I will post any rock solid solution I find.

OBiSupport:
This seems to indicate that your VoIP service provider delivers DTMF signal with a somehow weak signal strength. It could be either attenuated, or have a lower signal level on digits regeneration, compare to regular PSTN network. Regular telephone phone generates DTMF signal at -5 dBm ~ - 10 dBm level.

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