Originate a call with Asterisk - without the originating extension ringing

Question

I have a completely standard installation of Trixbox with 2 SIP extensions set up on it.

Both extensions are Snom 370 SIP phones.

I can originate a call from one extension to the other using the following CLI command:

originate sip/101 extension 102

This causes the phone on 101 to ring, then when that phone is picked up it dials 102.

What I would like is for the phone on 101 to automatically call 102, without 101 waiting to be picked up.

Is this something that can be done, or do the SIP phones always need to ring before they place a call?

Answer 1

I ended up creating a couple of new contexts in extensions.conf

[clickoutcontext]
exten => _X.,1,NoOp("Click In Context")
exten => _X.,n,SIPAddHeader(Call-Info: <sip:pbx.your-company.de>\;answer-after=0)
exten => _X.,n,Dial(Sip/${EXTEN})

[clickincontext]
exten => _X.,1,NoOp("Click Out Context")
exten => _X.,n,SIPRemoveHeader(Call-Info)
exten => _X.,n,Dial(Sip/${EXTEN})

And then using an AMI action to make the call:

ACTION: Originate
Channel: Local/101@clickoutcontext
Exten: 102
Priority: 1
Timeout: 60000
Context: clickincontext

This sends a header to the Snom phone making the call to tell it to auto answer and then removes it before the call is placed to the second phone.