I just found that call transfers between SIP extensions are working, however, if one leg involves a DAHDI extension, bizarre things happen.
Here is an example that just happened to me, and I repeated it to verify.
- A call comes in and is answered at a DAHDI extension.
- Press *2, enter extension to transfer to.
- Hang up after the they answer.
- Now, both legs hear music, they cannot talk with each other. If they hang up, 30 seconds later they get ringback with music when they pickup.
I have to go to FOP and manually kill the call.