I'm looking at various voip phone systems and i've received quotes from several vendors. I'm trying to understand why a Cisco UCCX solution would costs 3 times the price of another solution (Vertical Wave IP) which is a single box solution, but two boxes for redundancy.

Both solutions are similar in setup with 125 sets total across 5 locations, two systems for redundancy, call center, mobile apps, call recording, call, tree, etc. The major difference is Vertical Wave IP says we can use our existing routers at the 4 locations while Cisco says they need to be upgraded.

Thank you for your feedback.