Cisco 1604-r DNS using NBT (137)

Need help. Netbios is using dns(53) for name resolution(137) thus bringing up our Isdn line.

I already tried using an access list and dialer list

access list 101 deny udp any any eq 137
dialer list 1 protocol ip list 101

This is what thesniffer found.

UDP: —– UDP Header —–
UDP:
UDP: Source port = 137 (NetBIOS-ns)
UDP: Destination port = 53 (Domain)
UDP: Length = 55
UDP: Checksum = 62B6 (correct)
UDP: [47 byte(s) of data]
UDP:
DNS: —– Internet Domain Name Service
Anyway is there anybody out there that can come up with a different filter to filter this traffic?