Not exactly "recall", but rather "check up" is how I and my buddies use "tone".
Whistles tell the birds exactly where you are. Voice tells the birds where you are. Tone is much more stealthy.
If you hunt wild pheasant, stealth is a prerequisite.
You CAN teach them that different tone patterns (1 beep, 3 beeps, etc.) mean different things.
The critical thing is that the dog knows the commands in yard work before extending the distance with a collar. In the yardwork, my word (for check up, change direction) was "ho". When adding the collar, just use both the voice and tone together, eventually dropping the voice.