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Mitel Integration

I am integrating ip telephony with a mitel sx-2000 pbx. we have is a T-1 from a 6608 blade to the mitel box. Here is my problem. If I make a call from an ip phone to an outside line, the call goes through. If I then try to make a call from an ip phone to a phone on the pbx, I get a fast busy signal. I can still make ip phone to ip phone calls and I can make pbx calls to ip phones. I have to wait about 10-15 minutes before I can make an ip phone to a pbx or outside call. Running the show port voice active command indicates that packets are passing through the router. Just trying to figure out why the mitel does not pick it up.

Any information would be greatly appreciated.

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