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Those beeps before and after each voice transmission are called Quindar tones. The reason for these tones was to, essentially, mute and unmute the dedicated phone lines that connected the transmission receiving stations to Mission Control in Houston. Because the phone lines were dedicated the noise between Houston and the capsule would have been constant, annoying and distracting the astronauts. Therefor the Quindar tones were built in.

Two tones were used in the Quindar system, named after its manufacturer, both being pure sine waves that were 250ms long. The "intro tone" was generated at 2,525 Hz and signaled the "key down" keypress of the PTT button. The "outro tone" was slightly lower at 2,475 Hz and signaled the release of the PTT button. The tones were generated by special equipment located at Mission Control, and they were decoded by detectors located at the various tracking stations.

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