I believe the Cisco ATA-186 supports it, but you'd have to do more digging on their site.

This is really not a protocol issue, but a vendor programming issue. It all depends on if you can get the hardware to do a hotline call when the phone is taken off the hook.

JT


Does anyone know if this can be done by any VoIP Technology (SIP, IAX,
IAX2 or MGCP) I don't know the protocols!


On Tue, 2003-03-18 at 09:56, Steven Critchfield wrote:
 On Tue, 2003-03-18 at 09:04, Don Pobanz wrote:
 > We have need of a ringdown circuit in an elevator. If someone picks up
 > the phone, it should dial another extension without any keys being
 > pressed. (There are no keys on the phone)
 >
 > If it was an incoming call to asterisk, the following lines in
 > extensions.conf would do the trick.
 > exten => s,1,Answer
 > exten => s,2,Dial,Zap/10
 >
 > However, the 's' state is not valid for just picking up a phone
 > (extension). With nothing being dialed there are no extension matches
 > to make. It is like the dial tone needs to time out in a very short
 > time and instead of getting the busy tone, asterisk should dial an
 > extension.

 in /etc/asterisk/zapata.conf, I think this is what you are looking for.
 ;
 ; Specify whether the channel should be answered immediately or
 ; if the simple switch should provide dialtone, read digits, etc.
 ;
 immediate=no


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