ringback signal

In telecommunication, the term ringback signal has the following meanings: 1. In telephony, a signal, usually consisting of an audio tone interrupted at a slow rate, provided to a caller to indicate that the called-party instrument is receiving a ringing signal. Note: This signal may be generated by the called-party servicing switch or by the calling-party switch. 2. A ringing signal returned to a caller to indicate that one of the types of delayed automatic calling is now ringing the called party. Source: From Federal Standard 1037C and from MIL-STD-188

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reflective array antenna
reflectivity
refracted ray
refractive index contrast
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regeneration
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reliability
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remote operations service element protocol
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