this can be done in a number of ways and what you decide in most cases will primarily be driven by budget. It seems like too small an environment for Call Manager, so you may want to look at Call manager express and unity express
these will allow you to use IP Phones. the call processing and voicemail will run in a router chassis.
Then what type of link you have, whether it's a private,point to point link between offices or if you want to do it over the internet, will dictate the rest of the design. Will you have a private link? you may be able to get away with a vpn over the internet between offices.
You could, with a small key system in one or both locations just use analog phones, establish a vpn over the internet and have a few analog ports at each site and acomplsh the same thing.
Again alot depends on budget, type of link, features needed, call volume between locations and at each location etc..
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...