I have integrated a CCM 5.1 (Main Office) with an Avaya S8400 G3 (Branch Office)using H.323 trunk connected directly from CCM to Avaya PBX over the WAN (T1). Everything seems to work fine except the audio quality. The average round trip ping reply is btw 100-120 which is quiet acceptable. We are using Cisco 2800 series routers in both ends. There's no Voice Vlan configured in the branch office. I though QOS may help to improve the situation. How am I going to prioritize the Voice traffic over data with H.323 Trunk? Any idea/config sample would be appreciated.