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If the called station is already busy and cannot accept a second call via call waiting, the calling party is alerted with a busy signal. When the call routing is successful and the receiving telephone is not already in a call, the destination telephone receives an electrical signal, called power ringing , or the ring tone , to alert the ...
No frequency is a multiple of another, the difference between any two frequencies does not equal any of the frequencies, and the sum of any two frequencies does not equal any of the frequencies. The frequencies were initially designed with a ratio of 21/19, which is slightly less than a whole tone. The frequencies may not vary more than ±1.8% ...
The General Post Office (GPO) [1] was the state postal system and telecommunications carrier of the United Kingdom until 1969. [2] Established in England in the 17th century, the GPO was a state monopoly covering the dispatch of items from a specific sender to a specific receiver (which was to be of great importance when new forms of communication were invented); it was overseen by a ...
A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail.
The WEP and GPO provisions outline how Social Security deals with retirees who receive pensions. Under the WEP, Social Security benefits are reduced if you receive a pension from work, did not pay ...
This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
Code 1: A time critical case with a lights and sirens ambulance response. An example is a cardiac arrest or serious traffic accident. Code 2: An acute but non-time critical response. The ambulance does not use lights and sirens to respond. An example of this response code is a broken leg. Code 3: A non-urgent routine case. These include cases ...
While Supplemental Security Income recipients will receive their first checks on December 30 (since SSI checks go out on the 1st of the month, but that is a holiday and weekend day in 2023), the ...