So it's not a case of positive disconnect then.

This sounds similar to a situation where users of ISDN/PRI services hear their phones ring, but, nobody is there.

Trapping messages on the "D" channel reveals a glitch that prevents the audio from turning on, thus the called party hears dead air.

Given that this problem is intermittent, Comcast could have a problem upstream. Calls hit a bad circuit and it fails. Another call hits a different circuit and all is well.

My suggestion....have Comcast verify the modem's programming. If it is confirmed to be good, have them trace out bad calls to see if they all have something in common.


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