sundance-communications.com Forums Telephony Discussion Phone & VoIP Systems Inter-Tel Telephones & Systems Connecting Intertel/Mitel 5000 to Nortel Option 81

Not sure best place to post this but will try Mitel forum as well.
I am trying to get a Mitel/Intertel 5000 connected to a Nortel option 81 via a T1/E1 module on the 5000 to a Dual Pri on the Nortel.
I can make a call from the 5000 to the Nortel but there is no speech and then the call drops.
I have a Nortel engineer available but he is running out of ideas. The Nortel card is set as master/Tie line/euro.
Any ideas out there as to why we can't get the two 'talking'?

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