Excellent question! I have spent many hours trying to decipher this whole licensing maze :) You are correct that all DLU's are lumped together at the end of the day, but the documentation does differenciate between the two license types. It seems like a "one way" street in that Cisco IP Phones can use the Third Party SIP licenses but not vice-versa. Have a look at the clips below;
Device licenses are required for Cisco devices and for third-party devices,*** with the flexibility to replace third-party devices with Cisco devices. Device licenses are sold in increments of device-license units (DLU's). Device-license units are assigned to each device connected to Cisco Unified CallManager 5.0. Each device is assigned a unit number based on the type and capabilities of the device. Devices with more complex and high-end capabilities are assigned a higher number of units compared to devices with basic capabilities,
Application and phone software licenses are enforced. The system manages the maximum number of devices that can be provisioned.
â¢ Each device (Cisco Unified IP phones, third-party devices, and video devices) provisioned in the system corresponds to a number of device license units (DLUs), depending on its capabilities; the total number of units is managed in Cisco Unified CallManager to determine capacity.
â¢ DLUs must be purchased to cover the number of devices connected to Cisco Unified CallManager.
â¢ Third-party SIP devices require DLUs for operation with Cisco Unified CallManager.
You have reached the Cisco Logistics Support Center.. To Check Status of
your RMA, visit Product Returns & Replacements (RMA). Need help? Contact
us by Phone or Email. North Americas Phone: 1800 553 2447 Option 4
Email: firstname.lastname@example.org Europe Phone: +3...
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 ...