Here is the config which define interesting traffic to and from any source and destination with tcp port 1494 and udp port 1604.
You can get idea about how to define or tune interesting traffic using access-list.
int serial0:23
dialer-group 1
!
dialer-list 1 protocol ip list 101
!
access-list 101 permit udp any eq 1604 any
access-list 101 permit udp any any eq 1604
access-list 101 permit tcp any eq 1494 any
access-list 101 permit tcp any any eq 1494