In an emergency call, what is often required for verification of a situation?

In an emergency call, verification of a situation is crucial for ensuring the appropriate response and assistance. The present phone number serves as a key piece of information. It allows dispatchers to confirm the caller's location and reach them again if necessary. This is especially important in emergencies where time is of the essence. By having the current phone number, emergency services can also trace calls to ensure that help is directed to the right place quickly.

The other options—license number, identification, and witness statements—while they can provide valuable information in certain contexts, are generally not as immediate or essential for the verification of an emergency situation during the initial call. The priority is to establish a direct and reliable connection with the caller, making the present phone number the most relevant element for urgent response purposes.