Thank aweaver.

I talked to my IT consulting company, and they said that I need to find out what the DSCP marking is, which i believe is the precedence tag you mentioned.

I figured out that rtp audio, h323/rtcp don't work. In my router rtp audios DSCP marking is just default, but h323/rtcp's DSCP marking is cs3. If you know what the DSCP marking is then i can add it.

Do you by chance know what that might be?