[macro-res]
exten => _1NXXNXXXXXX,1,SetGroup(res)
exten => _1NXXNXXXXXX,2,CheckGroup(4)
exten => _1NXXNXXXXXX,3,DIAL(SIP/${EXTEN}@ISP||T)
exten => _1NXXNXXXXXX,104,playback(tt-allbusy)
exten => _1NXXNXXXXXX,105,hangup()


exten => _NXXNXXXXXX,1,SetGroup(res) 
exten => _NXXNXXXXXX,2,CheckGroup(4) 
exten => _NXXNXXXXXX,3,DIAL(SIP/${EXTEN}@ISP||T) 
exten => _NXXNXXXXXX,104,playback(tt-allbusy) 
exten => _NXXNXXXXXX,105,hangup()