Connecting two different Conference rooms together

I want to connect two different existing conference rooms together as such that both conference rooms stays existed and user in conference rooms also stays in their respective conference rooms but members of conference room can talk and listen with other conference room members. I hope that i am able to describe my issue properly. I have browsed a lot but still unable to find the sollution for that someone has written to use local channel and originate command for that prupose but when i do that awkward type of noisy tone is produced and no communication could take place.

Can anyone help me in this ?
Thanx in advance to all asterisk gurus :smile: