H323/SIP room based system joins as trusted device or more precisely joins as authenticated user

Hi,

For security reason, we hosts internal meeting with feature "sign in to our domain only".  Instead of enabling "required authentication", I can only enable "waiting room" because H323/SIP room based system is always treated as guest.  And this is not ideal as we will always need a host to standby and admit these room based joining.

Does anyone know there is a way to have H323/SIP room based system joins as trusted/authenticated user?  Pairing seems to complicated for end user...

Many thx.