Which of the following is NOT one of the four basic operational methods for call routing?

The method that is not considered one of the four basic operational methods for call routing is call screening. In call routing, the primary operational methods focus on efficiently directing emergency calls to the appropriate response units or services.

Call referral involves transferring the caller to another service that can better address their needs, while call relay refers to passing information between parties when direct communication isn't possible. Direct dispatch means sending resources to the scene of an incident based on the information received from the caller.

Call screening, on the other hand, is more concerned with gathering and assessing information about the caller or the incident before routing the call, rather than being a method of routing the calls themselves. This function helps facilitate efficient call handling but does not fit into the core operational methods for routing calls in the emergency services context. Thus, it is the correct answer to the question regarding which method does not belong among the basic operational methods for call routing.