Well you have the POE switch, the 2811 router (depending on the ios ver installed in your 2811)and the IP phones, at this point you need a call agent and unity to support some of the features that you want.
Depending on the size of your office, entity and budget(total users, future users, features, etc)you must decide between the different cisco unified communicacion systems to use.
Hi, to add to the good advice given by Cesar, it looks to me that your requirement are well met by CCME, so I would look first into that, as you may know it's already embedded in IOS and would get your up and running in a short time.
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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 ...