What is your CME verision? seems to be fine apart some mandatory command which i don't see . Did you remove those intentionally like mac address type etc.., apart from that you need to look this
config
https://supportforums.cisco.com/document/12210701/fast-track-support-sip-phones
-88XX phones would be fully supported till CME 11
-88XX are supported via Fast Track Method.
-8800 KEM are only supported for 99XX phones in CME 10.5
-88XX with 8800 KEM are supported up to CUCM 10.5
As reference information:
Cisco CallManager Express 10.5 Supported Firmware, Platforms, Memory and Voice
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/requirements/guide/cme105spc.html
Fast track support for SIP phones
https://supportforums.cisco.com/document/12210701/fast-track-support-sip-phones
Cisco IP Phone 8811, 8841, 8851, and 8861 User Guide for Cisco Unified Communications
Manager 10.5
http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8811_8841_8851_8861/10_5/english
/userguide/P881_BK_U42291C6_00_userguide-8811_41_51_61-10_5/P881_BK_U42291C6_00_userguide-
8811_41_51_61-10_5_chapter_00.html
Br,
Nadeem Ahmed
Br,
Nadeem
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