[general]
autofallthrough=yes

[globals]

[nexmo-trunk]
exten => _X.,1,Dial(SIP/${EXTEN},30)

[internal]
exten => 666,1,Dial(SIP/666)
exten => 777,1,Dial(SIP/777)
exten => _X.,1,Dial(SIP/${EXTEN}@nexmo-<phone_number>)