Unable to Dial through Analog Trunks - Xorcom FXO

blangys

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#1
So I had an issue at my client where I could dial from my SIP phones sometimes. It would work maybe 1 out of every 8 tries. I'd watch the asterisk console and see that the correct digits where handed to the DAHDI port where the dialing was going to take place. I worked on it for hours, eliminating handsets, lines themselves, polarity on lines, and many other steps. In the end, the DTMF tones where not being played long enough by the Xorcom Astribank to have the carrier recognize them all of the time. This isn't specific to the Xorcom box, but would apply to any FXO in this case. I've never had this happen before. The fix was to edit the /etc/asterisk/dahdi-channels.conf file and ad a statement:

toneduration=300

So while I didn't know this was a DTMF issue, it proved to be.

Cheers
 

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