As I understand it, a 'basic' SIP phone is one which is capable of making basic calls, and an advanced SIP phone would be one that might have extra features such as video calling.
When you configure the phones, you add them as either type and the decision on which type they are belongs to you.
The DLUs are the same DLUs that you use for Cisco phones, so if you provision enough DLUs to cover the Cisco phones your post suggests you will migrate to, you would be able to delete a SIP phone, add a Cisco one, and not have to purchase more DLUs.
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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 ...