got following hint from c.richter from beronet support team exten => _8.,1,waitfordigits(4000) exten => _8.,n,Macro(anrufextern-sip,${EXTEN:1}) exten => _9.,1,waitfordigits(4000) exten => _9.,n,Macro(anrufextern-analog,${EXTEN:1}) now it gets all digits