STS is a form of Relay Services that provides Communications Assistants (CAs) for people with speech disabilities who have difficulty being understood on the phone. STS CAs are trained individuals familiar with many different speech patterns and language recognition skills. The CA makes the call and repeats the words exactly. Individuals using STS include those with cerebral palsy, Parkinson’s disease, a laryngectomy, ALS, stuttering, muscular dystrophy, stroke, and other conditions affecting clarity of speech.
STS Relay is available via 711 in the U.S.; in a telephone call, first dial 711, then ask for STS. A trained communication assistant will ask you what number you want to call. The assistant will repeat what the caller with the speech disability is saying. The callee can then respond. The caller can then reply. The communication assistant will revoice the caller's message. The callee then responds in this three-way assisted phone conversation.

لما نريد تقوية تيار الماء الصاعد إلى المبنى مثلاً نركب مضخة ريلي
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فكلمة مرحل كترجمة للكلمة الإنجليزية
relay
لا تخدم المعنى بالعربية