[cisco-voip] Dry Closure Phones

[Eric Butcher]

With contact closure, you use a pair of wires to create a loop to signal a channel open, and a separate pair of wires to carry the audio (traditional tip and ring pair).  You cannot do this without an adaptor.  The best way I have found is to use a bogen tam-b or a pagepal, connected to an FXO port.


Eric Butcher
Cisco Unified Communications Engineer
CDW Professional Services
11711 N Meridian, Ste 225
Carmel, IN  46032
* 317.569.4282 - IP Phone
* 765.744.1458 - Mobile
* eric.butcher at cdw.com<mailto:eric.butcher at cdw.com>
http://www.cdw.com/


From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of David Zhars
Sent: Tuesday, November 23, 2010 1:11 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Dry Closure Phones

An app we are installing at our Police Dept requires the phones to have a "dry closure" contact or something like that.
If I google this, I see a Dry Closure thing for 2600/3600 series, so I am researching that.
Do any phones supported by CCM 8 support dry closure?  Ultimately, I want the phones to work with SRST, so I probably don't want to stray too far from the Cisco wagon...

Appreciate any insight.
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