exten => ${ANCHORNR},1,SIPDtmfmode(inband)		; dtmf mode expected from media gw (inband|rfc2833|info)
exten => ${ANCHORNR},2,Ringing
exten => ${ANCHORNR},3,Answer(0.5) 				; answer after 0.5 s delay
exten => ${ANCHORNR},4,Progress					; enable feedback, unfortunately not ringing tones
exten => ${ANCHORNR},5,Read(DESTNUM)			; read DESTNUM digits, until "#" key
exten => ${ANCHORNR},6,SIPDtmfmode(info)
exten => ${ANCHORNR},7,Background(transfer)		; playing message: “Please hold while I try that extension…”
exten => ${ANCHORNR},8,Goto(mappings,s-${CALLERID(num)},1)  
exten => ${ANCHORNR},9,Hangup