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To: kumar who wrote (41208)	3/30/2001 11:58:56 PM
From: speedskier	Respond to of 54805

Hi Kumar, based on the info in cisco.com. , I have my doubts re the scalability of the solution. eg. how many servers would one need for a 50K user enterprise ? Sorry for the late response. It has been a long day. The current Call Manager operates on a PIII 1Ghz Compaq platform that will support up to 2500 phones / server. The Call Managers operate in clusters, with a Publisher and at least one Subscriber per cluster. The cluster operates as a group, ie, with a single database serving the entire cluster. In the event of a failure of any of the Call Manager servers in the cluster, automatic failover occurs to a spare server. If my memory serves me correctly (sorry, it is late and I don't feel like looking it up) I believe you may utilize up to eight Call Managers per cluster. Another key element to realize is that the Call Managers only exist to set up the call. Once a call is in process, the RTP stream occurs directly between the two IP Telephone handsets. A large installation will utilize multiple Call Manager clusters distributed throughout the Enterprise. The clusters are aware of each other and will hand off call processing appropriately. The objective is to keep your clusters as close as possible to the user so that telco failures won't isolate a group of users. I realize this is counter intuitive to a traditional PBX design, which relies more on centralized processing. Cisco has told me this technique will scale to 100,000 telephones. Hopefully, I will have the opportunity to test that soon (Any sales leads here? <g>). I am sure I am boring most of the audience here with my techie talk, so if you would like to discuss the finer technical details of Avvid, I would be pleased to do so PM. Regards, Skier