It's not super cheap, but Cyberdata makes a SIP enabled intercom that is vandal proof and has a dry contact relay built in to actuate a door strike.
http://www.cyberdata.net/products/voip/voip-intercom.html Cory J Andrews Director, New Market Initiatives VoIP Supply, LLC 454 Sonwil Drive Buffalo, NY 14225 716-250-3402 OFFICE 716-630-1548 FAX 716-601-4474 MOBILE [EMAIL PROTECTED] NOTICE: The information contained in this email and any document attached hereto is intended only for the named recipient(s). It is the property of the VoIP Supply, LLC and shall not be used, disclosed or reproduced without the express written consent of VoIP Supply, LLC. If you are not the intended recipient, nor the employee or agent responsible for delivering this message in confidence to the intended recipient(s), you are hereby notified that you have received this transmittal in error, and any review, dissemination, distribution or copying of this transmittal or its attachments is strictly prohibited. If you have received this transmittal and/or attachments in error, please notify me immediately by reply e-mail or telephone and then delete this message, including any attachments. Our mailing address is 454 Sonwil Drive, Buffalo, NY 14225 USA. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of C F Sent: Thursday, July 24, 2008 9:28 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] IP door opening devices leave the existing keypad there. as for integrating it with asterisk. use an ata with 2 FXS ports. one FXS port connect to a viking door box http://www.vikingelectronics.com/ and set the ATA to do hotline on it. that door box is a regular analog phone in the shape of a door box that when call is pressed it goes offhook hence the requirement of hotline mode. it also has auto answer that when you call the box it goes off hook automaticaly. then use a relay from http://www.mikesandman.com/ that gets activated on ring connect that to the second FXS and that will unlock the door. On 7/24/08, Chris Bagnall <[EMAIL PROTECTED]> wrote: > Greetings list, > > We have a client with an analogue door intercom/opening unit which we're > attempting to replace with an IP variant. The existing unit has the > following functionality: > > 1) Intercom - visitor hits "call", talks to operator > 2) Door opening - operator can open the door by dialling a 4-digit PIN > followed by * (the door unit interprets the DTMF tones) > 3) Door opening - the door unit has a numeric keypad to enable approved > persons to enter by entering the 4-digit PIN on the keypad > > We've tried getting the existing unit working with an ATA, but it's only > about 50% reliable (hangup not always detected, DTMF not always detected, > etc.), so it's probably time to look at fully IP alternatives. > > Any suggestions gratefully appreciated. > > Regards, > > Chris > > > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2008 - September 22 - 25 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users