The probable cause of an IP phone displaying this error message is that the Phone Productivity Service (PPS) Dynamic Link Libraries (DLLs) could not be registered during installation.
To register DLLs, perform these steps:
Note: You also may want to verify the subscription. For more information, refer to Subscribing to Cisco IP Phone Productivity Services.
For more information about resolving PPS, refer to these documents:
Voice applications (CRS, PA, CCM Plugins, CER, CCC, MeetingPlace, etc.)
Cannot request a service
When pressing services button
Service Subscription Validation Failed
IP phone productivity services (PPS)