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I am deploying a VoIP solution and I need to link the internal IP phones to a PSTN line. SPA8800 would be a perfect candidate for this.However, I need the gateway to NOT pick up the line until an internal IP phone has answered the call, both because ...
I had this problem too, it cannot be done, AD won't find users when searched through an UPN suffix, only through their real domain.
I had to put an openLDAP proxy inbetween to rewrite domains