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Based in the DNAS datasheet Aironet is supported, can you share mode details?"Use Cisco DNA Spaces Connector to connect to Cisco Aironet WLC 8.0 and Cisco Catalyst 9800 Series WLC 16.12.1 and above"
https://www.cisco.com/c/en/us/products/collateral/w...
Just an update on this comment, per the compatibility matrix CME 11 and 11.5 supports IP Phones 8821 but still only on Fast Track Mode:https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/requirements/guide/cme115spc.html
Setup for SIP phones vs SCCP Phones is different. You can look at this post for better reference.
https://community.cisco.com/t5/collaboration-voice-and-video/configuring-plar-hotline-using-sip-phones-on-call-manager/ta-p/3155930
You can refer to this document on page 4:
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/10_5_2/ccmfeat/CUCM_BK_C3A84B33_00_cucm-feature-configuration-guide_1052/CUCM_BK_C3A84B33_00_cucm-feature-configuration-guide_chapter_0101000.p...
