[Freeswitch-users] How can I cancel a play_and_get_digits?

Hi, I am using an play_and_get_digits in an ESL program.   Based on an external event, I need to cancel the play_and_get_digits operation. If I send a "break", it only seems to stop the audio from playing, but the  play_and_get_digits operation continues, and later the response event comes. How can I stop the entire play_and_get_digits operation from ESL? Thanks, David