Hi Nicolas!
I've tries the blind_transfer=1 option, and it works like hell 
For "Dial", "Call pickup" and "Listen" fuctions it seems to be an issue about permissions.
Se debug below. Do you have any idea where these permission issues is?
1.1.101.5 <= <msg data="1|originate|3|1bc740888fe559742f81224f7a1463c8" />
127.0.0.1 -> Action: Originate
127.0.0.1 -> Channel: SIP/645
127.0.0.1 -> Exten: 647
127.0.0.1 -> Context: from-internal
127.0.0.1 -> Priority: 1
127.0.0.1 -> CallerID: <645>
127.0.0.1 -> Async: True127.0.0.1 <- Response: Error
127.0.0.1 <- Message: Permission denied
127.0.0.1 <- Server: 0Response: Error
Message: Permission denied
Server: 0
Best Regards
Stian