Which of the following is NOT a method used for call routing?

The answer is based on understanding the different methods used for call routing in the context of emergency services. VoIP Transfer, while related to telecommunications, does not function as a traditional call routing method within emergency response systems. Instead, VoIP (Voice over Internet Protocol) is a technology that allows for voice communication over the internet, but it does not refer specifically to a method by which calls are directed or managed within emergency service operations.

In contrast, Direct Dispatch refers to directly sending emergency responders to a scene based on the information provided by the caller. Call Relay involves passing information from one dispatcher to another when the initial dispatcher cannot directly send help. Call Referral is the process of directing a caller to the appropriate agency or service that can address their issue, but still maintains the context of routing the call in some capacity.

Thus, recognizing that VoIP Transfer stands apart by focusing on the technology itself rather than a traditional routing method clarifies why it is the option that does not belong in this context.