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Touch Intercom-Ring or Intercom-Voice to use the MERLIN system Intercom feature. Test your voice terminal and program its features by sliding the T/P switch to T (Test) or P (Program). Adjust the volume of your voice terminal’s speaker and ringing using the volume control. Read on to learn how to use these features...and many more. Tailor your voice terminal to meet your individual needs by programming available buttons with custom features. Use Conference, Drop, Transfer, and Hold for efficient