Why i don't hear anything?

I tried to generate a call from AMI, but i don’t hear anything…

I runed the following scrip:

where “siptraffic” is a sip trunk (sip telephone provider)

action: originate
channel: SIP/siptraffic/0040745171302
waittime: 30
callerid: 0040745171302
exten: 0040359101186
context: from-internal
async: true
priority: 1

i tried with

action: originate
channel: Local/0040745171301@ from-internal
waittime: 30
callerid: 0040745171302
exten: 0040359101186
async: true
priority: 1

but no sound transfer…

Anybody can help me how i can correct? what is the problem?