QOS for VoIP application

[rsrdi]

I've got a pix 515E running 7.2(1) and I've set up QOS for a VoIP application using the following commands that I cobbled together from various Cisco documents:

pixfirewall2# config term
pixfirewall2(config)# class-map mck_vpip
pixfirewall2(config-cmap)# match port tcp eq 2698
pixfirewall2(config-cmap)# match port udp eq 2698
pixfirewall2(config-cmap)# policy-map mck_vpip_policy
pixfirewall2(config-pmap)# class mck_vpip
pixfirewall2(config-pmap-c)# priority
pixfirewall2(config-pmap-c)# end
pixfirewall2# config term
pixfirewall2(config)# priority-queue outside
pixfirewall2(config-priority-queue)# end
pixfirewall2# config term
pixfirewall2(config)# service-policy mck_vpip_policy interface outside
pixfirewall2(config)# end
pixfirewall2# write mem

Would any pix gurus have a look and see if I've missed something or should do it differently? The VoIP protocol our hardware uses sends everything on TCP and UDP 2698. It is a proprietary protocol from MCK/Citel. I've initiated both inbound and outbound calls with simultaneous massive downloads running on that internet connection and haven't experienced any call quality issues, so I'm hopeful that I got it right.

Any and all tips are greatly appreciated.

Thanks,

RS