Sjinndoawi,
I don't know if you've gone ahead and ordered parts, But the 2500 has BUILT-IN DTMF Decoding on the Primary Receiver (either through built-in HW or may done in the software when plugged in through USB). If you purchase the DTMF board, it is to allow the second receiver to decode DTMFs and allow for remote control of the primary receiver and software functions. I think the function is called Remote Commander.
The software allows you to leave the second receiver tuned to a frequency and through another transmitter, use DTMFs to change radio settings. You can define what you want the DTMF tones to do.
Hope that helps.
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