Equipment Manufacturer testing and certifications. End Users: Before you purchase- Verify compliance to standards and P25CAP. Custom test plans verify manufacturer’s features/services/specifications. After purchase- Subscriber Unit Certification for your system. Assess P25CAP compliance and your "User Defined" requirements (documents, test results, features and services). Interoperability Assessment - Still P25CAP compliant; interoperable with other agencies? Audit your system to ensure it.