Setting and Transmitting Call Tones Your radio can transmit different call tones to other radios in your group so you can alert them that you want to talk. To set a call tone: 1. With the radio on, press MENU 3 times. The current call tone setting flashes and displays. 2. Press + or - to change and hear the call tone. 3. Press MENU or PTT to set the new call tone or turn feature off.
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Setting and Transmitting Call Tones
Your radio can transmit different call tones to other radios in your group so you can alert them that you want to talk.
To set a call tone:
1. With the radio on, press MENU 3 times. The current call tone setting flashes and displays.
2. Press + or - to change and hear the call tone.
3. Press MENU or PTT to set the new call tone or turn feature off.
http://www.motorola.com/mdirect/manuals/T50-T55_UserGuide.pdf
I re-read your post. I think you are talking about the "roger" beep, not the "call tone". So here is a better answer from page 21:
Transmitting a Talk Confirmation Tone
You can set your radio to transmit an unique tone when you finish transmitting.
It's like saying Roger or Over to let others know you are finished talking.
• To turn talk confirmation on, press + and hold while you turn the radio on. When
you release the PTT after transmitting, your call tone transmits and a dot with parethesis is displayed on the screen.
• To turn talk confirmation off, turn your radio off and then back on while pressing
and holding the + .