[Freeswitch-users] Multiple DTMF on group_confirm_key

Hi all, I've experimented with group confirm key and group confirm file. It works great. However, I was unable to give multiple DTMF digits to get the confirmation. I've set group_confirm_key=1234, I thought it will ask the 4 digits from the user. But it simply taken 1 and when the user presses 1, the call got bridged. Is there any way to specify multiple dtmf to be confirmed??