There isn't one, but you already know that :-)
What are you using it for? In an analog Merlin set, the T/P switch was used for programming. That is solved by the MENU button.
If T/P means TONE/PULSE, you have a different problem. Try # at end of dialing a pulse call and see if it stops the pulse dialing.
If none of these work, post back as a comment and I'll actually get out the manual with you. The link below gets you the 20L users manual.
http://www.wedophones.com/Manuals/AT&T/merlin%20legend%20R2%20mlx10d-28d%20&%2020L%20phone%20user.pdf
Carl
Carl
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