I currently have 3 PBX systems, Astra, Nortel rel5 and Avaya CM5. The Astra are used for routing all main calls. There is an E1 link between the Astra and the Nortel, and a Qsig link between the Astra and the Avaya.
No direct link between the Nortel and Avaya, all get routed via the Astra...
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