Hi, Now and then, I'm facing environments in which it could be helpful to integrate building intercom systems with Asterisk.
Those intercom systems are made of : - a main panel, showing company names and equiped with a speaker, a microphone and an optional video cam - a doorstrike - several intercom phone with an optional monitor and with a button triggering door's opening, - maybe other hidden components I'm not aware of. I've noticed that these intercom phone are connected to the main panel through a 4 or 5-wires cable. More precisely, for the video case I have in mind, it's a 4-wires cable: 2 thick wires (for energy ?) and 2 thin wires (for voice, video and command). Is there a standardized protocol available to run voice, video and command on 2-wires and most probably used by intercom systems ? Would you say it's possible to install several intercom phones on the same line, both ringing at the same time (but only one of them being able to answer) ? If positive, is it possible to connect one intercom line to asterisk and let an asterisk user talk or watch visitor before opening the door (through a DTMF sequence, for instance) ? Regards -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users