I would like to know if the 7020 handsets support P.A , paging (system is Avaya BCM). The handset features indicates an Intercom/Loud speaker call and would group paging come through.
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The 50xx, 60xx and 70xx series in conjunction with a SIP based KIRK DECT system support SIP info headers and therefore Auto answer.
I doubt that your SIP server allows for non proprietary signaling and therefore wont work with their own implementation of Paging / Auto Answer.
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