10.53.1.4. Prevention of consultation, transfering and hold by networked
conference party 
Switch A has a Conference and Switch B has Station 1. A member of
the Conference adds Station 1. If station 1 goes into consultation the
Conference then does not listen to Music On Hold or Ringback because
Station 1 has placed the Conference on Hold. The conference continues
as normal, stattion 1 can then bring in the consulted party into a conference
on its local switch which is chained to the original conference
See Section 143.5,
"Relevant AMOs" for information about the AMO-COT
parameter NOHO and interaction with switches which do not signal hold.