Calls Dropped on Hold

[skinswin]

This is an ongoing problem for over 2 years since the building was constructed. Intermittently when an incoming call is placed on hold the caller is dropped. It happens on 6 different lines. Some are in a hunt group, others are not. It doesn't happen at any particular time, the amount of calls, weather conditions, etc. Nothing consistent at all. We can go for over 1 week without dropping a call on hold, then we will drop 4-6 in an hour. We only drop calls when they are placed on hold or they are parked.

We have been working with the telephone company to try and resolve this problem. We had a Norstar system, that was then upgraded to a BCM 400. We have tried 2 BCM 400's. We have replaced all cables to the BCM, all incoming and outgoing wires, punch down blocks etc. The local Telco's Nortel expert has gone through our software settings and verified everything is correct. Telco has checked all voltages, line currents etc. We have placed balanced loop current attenuator on all lines. All to no avail.

I have also tried adjusting the timer from anywhere from 200ms to 900ms. The Central office is set to 800ms.

Any input you can give into this problem would be greatly, greatly appreciated. The telco is grasping at straws, and the next step is to re-route our dial tone through another CO.

Thanks in advance!!

 

[senk1s]

what type of trunk lines?
Did you reuse the trunkcards/modules from the norstar on the BCM?
does it ever drop live calls?

pri - look at the cause codes
smdr data might give some insight into call details

 

[skinswin]

All new trunk cards/modules. Never drops live calls. No error/cause codes