I got a CME connected with PBX, the pbx sip license is only 10 sip trunks, the CME has about 80 registered phone.
There is a VIP cisco number that i need to make it reachable from the nortel pbx any time.
There are 7 outgoing dial peers for mobile calls, national, international , etc ...
I only limited the dial peers with max-con 2, so that the possibility that the 10 sip trunks is small, and added a new dial peer for the VIP number with no max-con, but the cisco phone users complain they can't make calls with the pbx lot of times.
Also i can't control the incoming sip trunk, for example, if 9 sip trunks are used, i don't need any more sip trunks incoming or outgoing except for the vip numbers.