Cisco 7925G VoIP phones require specific settings to inter-operate with Meraki MR access points configured with WPA2-PSK association requirements. For more in-depth information on integrating Cisco 792xG with MR Access Points, see the Cisco Unified Wireless IP Phone 792xG + Cisco Meraki Wireless LAN Deployment Guide.
Please ensure the WLAN settings are as follows:
Note: There is a bug in the earlier Cisco 7925 firmwares which causes the handsets to fail RADIUS authentication. It is advised to use firmware version 1.4(5)3 or later where the issue is resolved.