Dropped calls and trunk overflow

[Magillicuddy]

I was reading thread461-1258997 and was wondering what they meant by trunk overflow. Is the over flow being done at the CO level or in the switch.I have an avaya 8700 with a remote campus with 9 G700 gateways.

I have trunks terminating at our 8700 and have the calls routed across our fiber to our G700's. At the same time I have calls terminating in the G700's. All the trunks in the individual gateways have their own trunk groups. So gate way 5 has one trunk group 50 with 46 ports (ISDN)
Gateway 6 has 1 pri trk grp 60 and so on. I see alot of 100% atb in the trunk groups but never 100% utilization.

Is there something I am missing, can I control the trunk overflow routes. or as I said is it done at the CO level.

I am also fighting dropped calls issue. when a rep signs on to a CM4 sporadically he will notice on their phone and hear the call come in and drop some times only once some times up to 6 times before a call is established properly. Any Ideas. I changed out the two MM717 boards in the most occuring sets but they are still there.

 

[ISDNman]

Not 100% sure what you are asking.

IN any circuit switched network there are trunk groups. A trunk group may or may not have an overflow group. And the overflow group may or may not have an overflow group.

For outbound groups your PBX determines the call routing to a trunk group on the real network. In this case the overflow would be determined at your end. However once it hits the network it may or may not hit an overflow group, but this should not matter to you.

I quick example.

Let's say you have a PBX with a PRI to your LD carrier (TRK GRP 1) and a second PRI to your local LEC.

LD calls get routed to TRK GRP 1) and local calls get routed to TRK GRP 2.

A third group consisting of 5 analog lines is TRK GRP 3 and serves as the overflow for TRK GRPs 1 and 2.

Or, you could have TRK GRP 1 overflow to TRK GRP 2 (since the PRI form the LEC could have an LD PIC). In this case, TRK 2 could then overflow to TRK 3.

So, it is just a matter of how you prioritize circuit switched trunks. There is no good analogy to packet switched networks like IP.

 

[Magillicuddy]

thank you