Someone

[macro-checkcountry]

exten => s,1,set(NPA=${MACRO_EXTEN:0:3})
exten => s,2,GOTOIF($[ "${NPA}" = "418"]?canada|1)
exten => s,3,GOTOIF($[ "${NPA}" = "514"]?canada)
exten => s,4,GOTOIF($[ "${NPA}" = "250"]?canada)
exten => s,5,GOTOIF($[ "${NPA}" = "604"]?canada)  
exten => s,6,GOTOIF($[ "${NPA}" = "778"]?canada)
exten => s,7,GOTOIF($[ "${NPA}" = "780"]?canada)
exten => s,8,GOTOIF($[ "${NPA}" = "403"]?canada)
exten => s,9,GOTOIF($[ "${NPA}" = "306"]?canada)
exten => s,10,GOTOIF($[ "${NPA}" = "204"]?canada)
exten => s,11,GOTOIF($[ "${NPA}" = "807"]?canada)
exten => s,12,GOTOIF($[ "${NPA}" = "705"]?canada)
exten => s,13,GOTOIF($[ "${NPA}" = "819"]?canada)
exten => s,14,GOTOIF($[ "${NPA}" = "709"]?canada)
exten => s,15,GOTOIF($[ "${NPA}" = "902"]?canada)
exten => s,16,GOTOIF($[ "${NPA}" = "506"]?canada)
exten => s,17,GOTOIF($[ "${NPA}" = "450"]?canada)
exten => s,18,GOTOIF($[ "${NPA}" = "613"]?canada)
exten => s,19,GOTOIF($[ "${NPA}" = "416"]?canada)
exten => s,20,GOTOIF($[ "${NPA}" = "905"]?canada)
exten => s,21,GOTOIF($[ "${NPA}" = "519"]?canada)

exten => canada,1,Set(${SIP_CODEC}=g729)