We are in the process of getting a SIP trunk setup and I am looking at QoS on our GW's. I have setup the various SIP rules in the access rulebase for the router that will be the endpoint for the trunk. I also have a QoS rule for a 5Mbps Guarantee on the SIP traffic as we are only getting 16 x g.711 SIP channels. We are on a 100Mbps Network.
I have been told however that I may want to consider setting up Low Latency. I have had a look at this but its pretty complex stuff. I have worked out the constant bit rate should probably be around 1440 Kbps but trying to work out the Maximal delay is almost impossible!
I am sure other people out there have SIP running over their GW's - what do other people do? Any help appreciated.