Hi Adam,
As I understand it (but I could be very wrong!) sip is only used for
the initiation of a session. The data itself is transfered using the
Real-Time Protocol (RTP), so this should also be entered in your qos
table. The ports my sipura uses for RTP are 16384-16684, and I guess
these are pretty standard, although you should look at the sip page of
your atm to check it uses the same ports. The protocol used for RTP
is UDP ( not TCP). It's also worth putting any p2p stuff on low
priority.
Having said this, QOS has a rather bad reputation. I think you would be
better putting the ATM first (dumping your modem/router) and plugging
it into a router, then your would not have to worry about qos.
Bill