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  1. 3CX Extension to External PBX (Grandstream UCM)

    Hello All, RE: 3CX PRO/Version 20.0 I can setup my SIP Trunk in 3CX, but I'm failing to locate in these forums how to dial from 3CX to my remote Grandstream UCM6202. -I'd like to go extension to extension (video to video), e.g., 3CX extension to external PBX (UCM6202); -I tried 3CX years ago...
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