In this document Cisco TAC engineer "Michael Combs" has explained about issue - 7925G handsets failing Association to AP due to Association Status code 201 and Reason: 'Call failed: TSPEC QOS Policy does not match'
Cause / Problem Description
7925g issues - Phones are not able to register to CUCM
5500 Series Wireless LAN Controller (AIR-CT5508)
WLAN with Cisco Unified Wireless IP Phones
AIR-CT5508-50-K9 // upgraded firmware for phones and wireless controller will not accept phone registrations
Debug on the WLC showed that the 7925G was failing association as the AP was returning an Association status code of 201.
This is due to a TSPEC request from the handset being refused due to the WLAN configuration. The WLAN the 7925G was attempting to connect to was configured with a QoS profile of Silver (UP 0,3), rather than Platinum (UP 6,7) as required. This lead to a TSPEC mismatch for voice traffic/action frame exchange from the handset via the WLAN, and ultimately a rejection from the AP.
Create a new WLAN with a QoS profile of Platinum specifically for the 7925G handsets and configured as per established best practices, and as defined in the 7925G deployment guide: