penelope

If you have Avaya Site Administrator (ASA) you can run trunk analysis to see what your usage is. You will need to set up a job that runs once a day and gathers the information. Do a search on ASA for 'trunk analysis' (I am not at work so can't look it up now). The longer you can run it the better. I have ASA set to be able to log on automatically and leave the software up and running on my PC every night. It runs at 10pm. Make sure that all connections are closed and it is totally disconnected or it won't run.

When you have collected the data you can run the Trunk Analysis. It will tell you how many trunks were needed out of each trunk group. Say... you needed 8 of the LD trunks and 40 of the other then you know that in total you needed 48 trunks, which could all be handled by the 3 T1s.

My HQ system is a little over trunked but it is a bit of protection in case a circuit should go down then the others can take up the load. I have had instances where all of the DID trunks were down. I can't do anything about the inbound DID not working but the other 3 trunks can take up the slack. I also have 1 LD trunk from another carrier and the CO trunks as backup.

I have also had the group of 3 T1s go down where all the inbound toll free come in. I have created DIDs that go to the same point as the toll frees would normally go in case I need to have the carrier re-route them to the other trunk group.

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Penelope