Howto: reproduce 7706

ALl you need are 2 channels, they can be of any technology, I've seen this with Zap channels and SIP channels, but my example will use the Zap channels.

You'll need to have this in the context that the channels land in:

exten => 0,1,AgentLogin(1)
exten => 101,1,Dial(Agent/1)

exten => _aX.,1,MeetMe(${EXTEN:1},dx)

So you'll get one of your phones to dial 0, the other dials 101.  They are now talking to each other.

Now, paste the following into your manager session: adjust the ExtraChannel and the Context to suit your needs

Action: Redirect
Channel: Agent/1
ExtraChannel: Zap/49-1
Exten: a555
Context: vericonf
Priority: 1


Now they're talking in a conference.  We'll finish the conference by getting the agent to hit * and Zap/49 will then hang up.

The agent will then hang up as well freeing their Zap channel.  This channel will now be deadlocked and will remain unusable until asterisk is kill -9'ed