Based on the information I was able to locate, from my understanding, a person with hearing and speech disabilities will dial 711 to contact a TRS communications assistant, who facilitates the call with the other party. The caller will give the assistant the number he or she wants to call. When the other party answers, the assistant will ask, “Hello, this is the relay service. Have you received a relay call before?” The assistant then acts as an intermediary, relaying the text of the caller in -voice to the other party, and converting back what the other party said to text for the caller.
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