mozilla-b2g/gaia — pull request #6681 by gtorodelvalle (2012-11-28 12:38:59+00:00)
Title: Bug 815439 - While on a call, DTMF tone should play as long as button is pressed (r=fcampo)

During a call, in case the keypad is expanded and a key pressed, a tone is sent. This tone will last a minimum of 100ms or until the user releases the key.