Is Access to the Phone API Allowed application control policy rule
This rule specifies whether an application can make calls, answer incoming calls, and access call logs on a BlackBerry® device. You can configure this rule to prevent an application from making calls on a device or to prompt a user whether the user wants to permit the call before the application makes calls.
If you change the value to Not permitted, an application cannot answer incoming calls. You can change the value to Not permitted to help prevent malware applications from answering incoming calls without prompting the user.