[c-nsp] Port 1720 & 1863

[abs]

Hello all,
I am new to cisco (cisco 2800 series) so please excuse my ignorance.  I have the following acl applied to all inbound traffic on the WAN interface:

ip access-list extended WANInBoundACL
 permit udp any range bootps bootpc any range bootps bootpc
 permit tcp any any established
 permit udp any eq domain any
 permit tcp any any eq 22
 deny   ip any any log

When I run a port scan I see port 1720 as well as port 1863 open.  Port 1863 tends to open and close at random (don't understand why).  I realize that I may need to add an explicit entry in the ACL's for port 1720 as the service runs by default given the version of IOS that I am running.  

What I am failing to understand is why the above 2 ports are open even though I have a deny all statement at the end of the ACL.  Am I misunderstanding something?  Would someone be able to point me in the right direction?  Thank you in advance.

cheers,
abs