Core Issue
This phone type is not removed from the switch port details until the next full switch-port and phone update process is run.
Resolution
To resolve this issue, you can manually run the process on the switch or on all switches.
Refer to the Manually Running the Switch-Port and Phone Update Process section of Configuring Emergency Responder.
For more details about resolving Emergency Responder, refer to these documents:
Problem Type
Voice applications (CRS, PA, CCM Plugins, CER, CCC, MeetingPlace, etc.)