In regard to features, well it all depends on what is important to u. comparing cisco features to avaya is like comparing apples and oranges. Overall avaya has many more than cisco, but what matters is what is important to your company. From a features perspective you can't go wrong with avaya they give you the Kitchen Sink and then some :)
Put that in your pipe and smoke it all you Avaya lovers. I am not one of those "Cisco and only Cisco" guys but I honestly feel that for and end-to-end solution Cisco just flat out does the network better than Avaya and once you packetize voice you are only talking network data anyway. For only being in the IP PBX market for a few years speaks volumes to what Cisco has been able to accomplish. I will be the first to admit they come up short on some feature but they are being added fast. What they do well they do better than anybody though. At the end of the day I want performance and reliability as opposed to bells and whistles.
Avaya has good stuff, and their PBXs are extremely easy to configure. However, they are REALLY expensive. In a recent RFP of ours, the Avaya response was well more than double the cost of Cisco's response. That sort of pricing indicates that Avaya is rather proud of their equipment. :)
The choice between VoIP vendors comes down to features and pricing. Find the vendor who offers what you need at a price you can afford. You must also take into account support availability, support costs, training, documentation, etc., but it starts with features. Sure, some companies like Avaya offer a gazillion features but most companies will make use of just a few of them. The number of available features is important, but not as important as whether or not they offer the features you need now.
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The short answer is that you don't.... That isn't entirely true while at
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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 ...