Dead air calls routed to agents

[xyz111]

I'm trying to determine a possible cause for the following problem: agents get calls routed from a soft predictive dialler and the calls are just dead air, agents can't hear customer, customer can't hear agent. We listen into some of these calls and it's just silence.
No errors on the switch or TServer or in the TSAPI CTI application and seems to happen across the whole trunk group and to most agents.
I had a close look at some of these calls in the TSAPI application logs and most of them seem to fit the following pattern: the "silent" call has the same switch call ID with a call that has been dropped at the switch level hours before.
Anyone seen something similar?
Switch is 8700 running CM 2.2 and CTI via MAPD and Avaya TServer.

Many thanks for any pointers.

 

[wildcard100001]

Just a thought... check answer supervision on the trunk group. Play with the out setting. Lots of people will just hang up when a predictive dialer calls myself included. The result is a dead air call routing to an agent.

Thanks,

Wildcard