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Voip-Vet posted a topic in Extension SetupPbxnsip Zeta Perseids / Grandstream GDS3710 Video Door System Problem : when DoorStation makes a call to the pbx and an extension takes that call, there is only audio from the doorstation to the Extension, not the other way around. When I make a direct IP¨connection from the doorstation to one of the phones, all is well. Sip log of a call in addendum : could anyone look into this to check what might be wrong ? Any ideas very much appreciated ! Many Thanks, Marc Pbxnsip Grandstream Doorphone Sip Log.txt