Yes, you can use SIP phone with CCME, but the overall functionality will not good. Basically, cisco does not officially support non-cisco phones with CME. You will not have, or will have trouble enabling any feature like dual-line, call transfer, conference, etc.
I think the situation is not much different for CCM. Once something doesn't work with a non-cisco phones, you have no support from from Cisco.
I suggest you show him how the cisco phone works nicely in SCCP, with directories, etc.
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 ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...