I need to configure QOS for SIP and RTP on our LAN switches. We have approximately 60 hosts connected to 2 x 3550-SMI switches that talk directly to 6 x PBX's on the same switches (30 hosts and 3 PBX's per switch). The hosts are PC's that run a voice application. They are also used for normal data. We have been experiencing some lost SIP initiation packets and dropped calls.
Any suggestions on how to prioritise SIP and RTP on the LAN?