acejavelin

In theory, yes, that is what QSIG was designed for, interconnecting various manufacturers private branch exchange (PBX) systems with a common, standardized protocol, and both Nortel and Mitel support the protocol. Add a PRI card in both switches and a little programming magic and away you go. One needs to be the "master" or A side, the other the "slave" or B side for signalling, one needs to provide the clocking, one slaves to the others clock, you send DNIS digits, CLID, subscriber name, etc... just like a full featured PRI call, with extra stuff. Essentially the two PBX's become a CO for each other for these calls.

In reality, I have never done it this way, but have seen working implementations of it (so I know it does work). Personally, I have only tied Mitel SX-200's and Nortel Meridian PBX's together via "dumb" T-1 E&M tie lines only, and it works fine for basic calling between switches.

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Telephony users cannot gain anything without first giving something in return. To obtain a useful feature, a feature of equal value must be lost.

This is Telephony’s First Law of Equivalent Exchange.

jimmers

Thanks for the reply. It looks like I'll be giving this a try!