A phone number is provided which you can give to anybody to "Dial-In" via usual landlane/phone into the conference room of OpenMeetings - Every room has its own phone number. Currently room gets number
The users in the conference room can call anybody outside of the conference room by entering the phone number in the conference room - In room actions menu exist "SIP dialer". When user clicked dialer window appears.
3) Multiple Dial-In
You can give away multiple numbers and do the same as described in case (1). Multiple Dial- SIP transport can handle multiple rooms at the same time. Which rooms must be handled specified in settings.properties In is achieved by configuring the SIP-server (Asterisk). It is possible to create multiple extensions (phone numbers) in Asterisk configuration that will be redirects to single conference room.
4) Multiple Dial-Out
You can dial multiple numbers from within the conference room - From within conference can be dialed multiple numbers.