My company uses IOS versions until 8.2 due to the differences in the NAT-ting rules with 8.3 and 8.4. I did some research myself and I found that the material or the topic itself is a huge adventure (lots to read and understand). I am absolutely new in the enterprise firewall world but I would like to start learning how to configure ASA 55.
access-list 2001 permit udp any any dscp af31.
access-list 2000 permit udp any any dscp ef.
If subnets are set to high priority or open, specific UDP traffic passing through those subnets does not need to be listed individually. Here are some values users can add to their Cisco configuration file. Information on configuring these settings can be found here