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Sizing voip systems

bedwards
Level 1
Level 1

We have a client who purchased a 7750 with 150 Phones, they would like to expand the system by another 700 phones. I cannot find a tool to calculated the required DSP etc, we have 3524s with inline power, but there must be a limit. I would like to install a 6500 with voice card as the other site has 4 E1 connections. Has anyone had experience of these type of sites, I could put in 3 6500 with everything but I think the client would have a problem with costs.