VoIP Site Based Design Models

I spent sometime this morning reading through the various VoIP deployment models and how to implement high availability with each model while trying to get over this cold I currently have. So far I only went through the Campus model and the model that shows centralized call processing with multiple sites. In my current work environment we currently use the latter which is a centralized site that provides all the call processing which is then distributed to our multiple remote call centers. We're working on converting this into a more highly available solution which is a distributed model.

I plan on reading up on the other site based design guides that shows the distributed model along with a few others. I'm starting to see that there are multiple ways to provide redundancy using tools such as SRST (Survivable Remote Site Telephony), Distributed Communications Manager Express (CME), and many others.