Sip.conf - tos_audio

Hello List,

I’d like to know a bit more about the tos_audio values. In the ip-tos.txt file in the doc directory there is this snippet which are recommended values:

sip.conf tos_sip cs3
sip.conf tos_audio ef
sip.conf tos_video af41

Where can I find out a little bit more about the other values so I can do a bit of testing? Or can someone give me a quick one or two points on the other values.