Problem with that is every time somebody wants to call the person with the cordless direct they will also call the answer DN set.

Getting a proper Nortel cordless (Companion,M7410,T7406 & T7406e) would solve the issue.
Systems are designed mostly around digital sets and not so much ATA's (mainly for analog devices and not reception/callagents).

You could also overflow to the ATA.

As for half rings that is because the lines are programmed to ring at the ATA, AA beats it to the call......remove the lines from ATA's DN.



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