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Code Block
; seven-digit local numbers
exten => _NXXXXXX,1,Dial(SIP/provider/${EXTEN})
; ten-digit local numbers
exten => _NXXNXXXXXX,1,Dial(SIP/provider/${EXTEN})
; emergency services (911), and other three-digit services
exten => NXX,1,Dial(SIP/provider/${EXTEN})
; if you don't find a match in this context, look in [users]
include => users

Remember that the variable ${EXTEN} will get replaced with the dialed extension. For example, if Bob dials 5551212 in the local context, Asterisk will execute the Dial application with SIP/provider/5551212 as the first parameter. (This syntax means "Dial out to the account named provider using the SIP channel driver, and dial the number 5551212.)

Next, we'll build a long-distance context, and link it back to the local context with an include statement. This way, if you dial a local number and your phone's channel driver sends the call to the longdistance context, Asterisk will search the local context if it doesn't find a matching pattern in the longdistance context.