[Freeswitch-users] Call to Group goes Unanswered

I have a small group defined in my set up. and normally it works as expected (all phones ring at the same time). The other day we had a case where an incoming call was not answered. The caller was prompted to enter an "external access code", which of course she didn't have. What should have happened? Is there a way that the group could be defined so that, if the call goes unanswered, the call will be directed to voicemail? Thanks for your time. William.