[general]

[local] ; Local users end up here
exten => 800,1,Goto(default,s,1)      ; Get the main PBX internally
exten => 801,1,Dial(SIP/usernamehere) ; Internally call usernamehere
exten => 802,1,Echo                   ; Talk to yourself here

[default]
exten => s,1,Answer
exten => s,2,Background(enter-ext-of-person)

exten => t,1,Goto(s,2)

exten => 100,1,Dial(SIP/usernamehere)