I currently accept any “75xxx” numbers  and transfer to a conference with pin with no problem, however currently if they mistype the number they end up creating a new conference and sit there all by their self waiting.

I want to setup dialpllan entry that only allows a user to join a conference that already exists and is active.

Have read thru the wiki, and the 2  FreeSWITCH books looking for examples on how to do this without  creating database tables to store conference state…

In reading, looks like I can use ${} and get a “conference list” and with regex patterns might be able to check for existence of valid conference ID before joining them.

Does anyone have a simple approach to do this?  

Thanks

Stephen