voice service voip 
 h323
  call start slow
!
!
voice class codec 20
 codec preference 1 g722-48
 codec preference 2 g711ulaw
 video codec h261
 video codec h263
 video codec h263+
 video codec h264
!
!
!
voice class h323 100
 h225 timeout tcp establish 5
  call start slow
!
!
!
!
!
voice class called number inbound 1
 index 1 6xxxxxxx
 index 2 6xxxxxxx
 index 3 6xxxxxxx
!
!
voice class called number outbound 1
 index 1 6xxxxxxx

.........


dial-peer voice 9 pots
 destination-pattern 6xxxxxxx
 information-type video
 voice-class called-number inbound 1
 voice-class called-number outbound 1
 incoming called-number xxxx600
 bandwidth maximum 128 minimum 128
 direct-inward-dial
 port 0/0/0:15
 forward-digits all
!
dial-peer voice 8 voip
 destination-pattern xxxx600
 video codec h263
 voice-class h323 100
 session target ipv4:192.168.13.251
 codec g711ulaw