[incoming]
exten => s,1,Verbose(1|Unrouted call handler)
exten => s,n,Answer()
exten => s,n,Verbose(${CALLERID(all)})
exten => s,n,Dial(${ANPHONE}&${RECEPTION},60)
exten => s,n,GotoIf($["${DIALSTATUS}" = "BUSY"]?busy:unavail)
exten => s,n(unavail),Voicemail(101@default,u)
exten => s,n,Hangup()
exten => s,n(busy),Voicemail(101@default,b)
exten => s,n,Hangup()