Убираем нули в начале номера

extensions_custom.conf
[prepend-zero]
exten => _.,1,GotoIf($[ "${CALLERID(number)}" = "anonymous" ]?nochange)
exten => _.,n,Set(CALLERID(all)=0${CALLERID(num)})
exten => _.,n(nochange),Goto(from-trunk,${EXTEN},1)