As per cisco compatibility chart of CME 8.0 6911 phones is supported.
But when i checked the type in the ephone it's not available.currently we not able to register the phone with CME.
Please put a light on this.
I had the same issue , I had to upgrade to 8.1 I think
Check the CME roadmap below
6911 is supported from CME 8.1
Cisco Unified CME 8.1
Toll Fraud Prevention
Enables Toll Fraud Prevention on Cisco Unified CME to secure the Cisco Unified CME system against potential toll fraud exploitation by unauthorized users.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmetoll.htmlConfiguring Toll Fraud Prevention
Enhancements to SIP Phone Configuration
Allows you to verify SIP phone registration process, remove global registration parameters, and display details on phones that attempted to register with Cisco Unified CME and failed.
Cisco Unified CME Commands: show presence global through subnet.
Support for Cisco Unified 6901 and 6911 SCCP IP Phones
Adds support for new SCCP IP phones 6901 and 6911.
Ephone-Type Parameters for Supported Phone Types
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