Refer to the exhibit. Which troubleshooting step must be performed to investigate the issue?

Checking the calling privileges of both the line and the device is a fundamental first step in troubleshooting call failures or restrictions. This helps to determine if the user or device has the necessary Class of Control (CoC) permissions to dial the intended destination, which is a common reason for calls not completing.

Restarting the Cisco CallManager service on all nodes is a drastic troubleshooting step and should only be performed after exhausting simpler checks, as it impacts all active calls and services.

Resetting the destination SIP trunk would only be relevant if the issue specifically pointed to trunk malfunction or if no calls were able to route via that trunk, which is not implied as the initial investigation step.

Resetting the phone being called is irrelevant if the issue is with the calling party's ability to initiate a call; it does not address outbound calling privileges.