[asterisk-users] how to join calls - not barge?

[sean darcy]

I'd like to have an extension "join" a call. That is, C can join A and 
B, just as if it were an analog extension phone.

ChanSpy works, sort of. The problem is that once A or B hangs up, the 
channel is gone. With an analog extension, C would remain connected with 
B if A hung up.

Can I throw A and B into a confbridge and then add C?  Create a new 
channel that grabs the A <-> B channel? Or is there a more straight 
forward way to do this?

sean