No Cisco softphones are available for the Macintosh that would work with the UC520. Cisco has the Unified Personal Communicator that will work with the Mac, but it requires Cisco Unified Presence.
Your only option for a Mac softphone would be a 3rd party SIP client. I can't provide any guidance on that as I haven't tried to get a SIP softphone working with any express products. You would also likely lose some functionality with SIP clients.
gogasca - can you please let us know how your testing with XLite on the Mac and a UC 520 went? Also, can you post the proper configuration settings for PC and/or Mac based XLite clients for the UC520? That would be REALLY helpful!
If you provide this information we will gladly help you test it and report back (we are Cisco partners but we're also end-users in this case using a UC520.)
P.S.: This is far less important) - CounterPath apparently *just* released a version of Bria for the Mac 2 days ago. Would the config on the UC520 be different for this softphone vs. X-Lite?
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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 ...