call waiting

noun
a telephone service feature whereby a person engaged in a telephone call is notified by a tone that a second call is being made to the same number, and is able to talk to either party while keeping the other on hold.
Compare hold button.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To call waiting
Example sentences
To me, it is equivalent to talking to somebody on the telephone whose call
  waiting keeps chiming in.
Chimes for call waiting shall be suppressed by terminating call in progress and
  answering the call waiting.
Redial button for call transfer or call waiting when supported by telephone
  system.
Examples include unwanted voice mail, call waiting or toll-free calls that
  automatically roll over to toll calls.
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