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The Harvard sentences, or Harvard lines, [1] is a collection of 720 sample phrases, divided into lists of 10, used for standardized testing of Voice over IP, cellular, and other telephone systems. They are phonetically balanced sentences that use specific phonemes at the same frequency they appear in English.
Voice logging is the practice of regularly recording telephone conversations. Business sectors which often do voice logging include public safety (e.g. 9-1-1 and emergency response systems), customer service call centers (conversations are recorded for quality assurance purposes), and finance (e.g. telephone-initiated stock trades are recorded for compliance purposes).
Many systems are optimized for speech and would respond in an unpredictable way to non-speech signals (e.g., tones, noise). Guidelines for proper applications of voice test samples are defined in the PESQ application guide contained in Recommendation ITU-T P.862.3. [3]
A codec listening test is a scientific study designed to compare two or more lossy audio codecs, usually with respect to perceived fidelity or compression efficiency. Most tests take the form of a double-blind comparison. Commonly used methods are known as "ABX" or "ABC/HR" or "MUSHRA". There are various software packages available for ...
A voice call originating in the VoIP environment also faces least-cost routing (LCR) challenges to reach its destination if the number is routed to a mobile phone number on a traditional mobile carrier. LCR is based on checking the destination of each telephone call as it is made, and then sending the call via the network that will cost the ...
Interactive voice response (IVR) is a technology that allows telephone users to interact with a computer-operated telephone system through the use of voice and DTMF tones input with a keypad. In telephony , IVR allows customers to interact with a company's host system via a telephone keypad or by speech recognition, after which services can be ...
When connected to a line, a lineman's handset is essentially indistinguishable from regular subscriber equipment. The technician can monitor an active call, answer incoming calls, and make outgoing calls. Common tests include checking for dial tone, using ANAC to identify the line, and using a ringback number.
Plain Old Telephone Service (POTS), or Plain Ordinary Telephone System, [1] is a retronym for voice-grade telephone service that employs analog signal transmission over copper loops. The term POTS originally stood for Post Office Telephone Service, as early telephone lines in many regions were operated directly by local Post Offices. For ...