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Ringback number. A ringback number is a telephone number for a telephone line that automatically calls the line that the call was placed from, after the caller has hung up. The typical use of this facility is by telephone company technicians for testing a new installation or for trouble-shooting. [1]
raytheon.com (Archived) The Raytheon Company was a major U.S. defense contractor and industrial corporation with manufacturing concentrations in weapons and military and commercial electronics. It was previously involved in corporate and special-mission aircraft until early 2007. Raytheon was the world's largest producer of guided missiles. [3]
The Ronald Reagan Ballistic Missile Defense Test Site, commonly referred to as the Reagan Test Site (formerly Kwajalein Missile Range ), is a missile test range in Marshall Islands ( Pacific Ocean ). It covers about 750,000 square miles (1,900,000 km 2) and includes rocket launch sites at the Kwajalein Atoll (on multiple islands), Wake Island ...
There were reportedly three phone calls from Flight 11, five from Flight 175, and three calls from Flight 77. Two calls from these flights were recorded, placed by flight attendants: Betty Ong on Flight 11 and CeeCee Lyles on Flight 93. Alexa Graf, an AT&T spokesperson, said it was almost a fluke that the calls reached their destinations.
Perceptual Evaluation of Speech Quality (PESQ) is a family of standards comprising a test methodology for automated assessment of the speech quality as experienced by a user of a telephony system. It was standardized as Recommendation ITU-T P.862 in 2001. PESQ is used for objective voice quality testing by phone manufacturers, network equipment ...
The calls were made at 2:22 a.m. on Jan. 29, roughly four hours before O’Keefe was found dead. Higgins said he had no recollection of the calls. Albert said a one-second call from his phone to ...
Signal strength and readability report. A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their ...
Originally, lineman's handsets featured a rotary dial, but modern sets use some variant of the standard 12-button DTMF keypad and also employ an amplifier for speaker use. Most handsets are designed to be used with analog "POTS" lines, and have limited or no function with digital circuits. Older telephone linemen also referred to the handset as ...
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