Unnamed
public text v1 · immutableexten => s,2,GotoIf($[${CALLERIDNAME:0:${LEN(${RGPREFIX})}} != ${RGPREFIX}]?4:3) ; check for ring-group prefix
exten => s,1,GotoIf($[${CALLERIDNAME:0:${LEN(${RGPREFIX})}} != ${RGPREFIX}]?3:2) ; check for old prefix
;exten => s,1,GotoIf($[${CALLERIDNAME:0:${LEN(${RGPREFIX})}} != ${RGPREFIX}]?3:2) ; check for old prefix