On Wed, 18 Mar 2009, Chris Mason (Lists) wrote: > How does a Push-to-talk intercom interface with Asterisk?
I think the generic answer is "expensively". If Xorcom made just the IO part of their channel banks then it might be cheaper, however ... What I've seen so-far is an intelligent box with what's effectively an analogue phone interface that you connect to an FXS port. The intercom is basically a "hardened" phone - you push the button, the phone comes off-hook and dials a pre-set number. (or just goes off-hook and expects "bat phone mode"). The other end can send DTMF codes down to activate a relay which can then power a door opener - or not. Some boxes have a keypad, allowing a local code to be "dialled" which activates the relay directly, and some can dial internal extensions, letting the person who answers key in the unlock code. Some can even answer a call and listen for tones, so anyone could call the door-phone and unlock the door (eg. from your mobile phone while standing outside) But sometimes you just want a relay connected to the asterisk box because you have everything else - I eventually found a German company doing USB mains power cyclers which you could control from a Linux command-line program, so no need for a xorcom box after all. The options are endless as are the prices you can expect to pay. It all depends on the "intelligence" you need in the door. Ones I'm looking at right now: http://www.voipon.co.uk/2n-analogue-helios-door-entry-system-c-22_276_279.html Thats sort of the entry level. At least they have prices on their website unlike the recently posted North supply Link! (Why do sites do that?) Gordon _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
