[Freeswitch-users] collect digits during conference

Hi, I would like to be able to collect dtmf digits when a caller is inside a conference. The use case is to let people inside a conference to be able to invite other party by pressing "#6043434333#". Following the instruction, I am able to play a tone and execute play_and_get_digits after # is pressed, but I can't make it so that when the digits are pressed, the other control action won't be triggered. Does anyone know a good way to solve this problem? Thanks, Woody