closing unwanted ports - and what is 1720/tcp filtered H.323/Q.931

[kevin bailey <kbailey@freewayprojects.com>]

hi,

these ports seem to be open by default on a standard sarge setup 

PORT     STATE    SERVICE
9/tcp    open     discard
13/tcp   open     daytime
21/tcp   open     ftp
22/tcp   open     ssh
25/tcp   open     smtp
37/tcp   open     time
80/tcp   open     http
110/tcp  open     pop3
111/tcp  open     rpcbind
143/tcp  open     imap
443/tcp  open     https
1720/tcp filtered H.323/Q.931


the server will just be serving email and websites so can these services be
turned off?

PORT     STATE    SERVICE
9/tcp    open     discard
13/tcp   open     daytime
37/tcp   open     time
111/tcp  open     rpcbind

i presume they are mostly from inetd


the service:
443/tcp  open     https
is used to protect the webmail service.  it is meant to stop the email
passwords from being sniffed.

what is 
1720/tcp filtered H.323/Q.931
?

and how do i turn it off if it is uneccessary.

thanks,

kev