voice service voip
 allow-connections h323 to h323
!
application
 service misdialed flash://nonworkingnumber.vxml
!
dial-peer voice 1 voip
 description 
 preference 10
 service misdialed
 destination-pattern [1-9]...
 session target ipv4:<ip address of h323 gateway>
 incoming called-number [1-9]...
 dtmf-relay h245-alphanumeric
 codec g711ulaw
 no vad
!