What method of call sign identification is required for a station transmitting phone signals?

The FCC requires that every amateur radio station identify itself at specific intervals. When you are transmitting a voice (phone) signal, you are permitted to identify your station using either a voice emission (phone) or by using Morse code (CW). Morse code is universally accepted for station identification across all modes. This is particularly useful for automated identification systems on repeaters, which often send the ID in CW even while users are communicating via voice. The options suggesting you must use indicators like 'RPT' or 'R' are incorrect fabrications. Likewise, it is wrong to assume that voice transmissions restrict you to using only voice for your ID.