Hi, I have a conference system that use ESL Outbound connection, users can access the conference by an IVR menu. Today my conference receives about 50 simultaneous calls and this number is increasing. I want to develop a kind of architecture to receive a large amount of calls, but I don't know how. This is the possibilities: 1. I have a Intel Xeon 3460 (2.8GHz) server. I can upgrade the machine and this will increase the number of calls. How many extra calls will the server support if I upgrade it? Is there any kind of statistics? 2. I can have a entrance server that will balance the calls in different machines, so I will transfer the calls to the correct server by the conference number. Conferences from 0 - 500 I send to *Server A* and conferences from 501 - 1000 send to *Server B*. The problem of this solution is the transfer operation - I suppose that it's an expensive action. Is there any other option? Thanks, -- Samuel Macedo