10.53.1.1. Hold a Conference 
An analog telephone user can use the consultation hold feature to
place a conference on hold. They can not use the Group Park (hard hold)
or Call Hold feature to place a conference on hold.
A Keyset user can use the Manual/exclusive Hold feature or the consultation
hold feature to place the conference on hard hold or soft hold.
A Digital Feature Telephone (DFT) can use the consultation hold feature
to place a conference on hold (soft hold). They can not use the Group
Park (hard hold) feature to place a conference on hold.
Executive/Secretary (CHeSe) telephone arrangements can use the features
associated with the physical device and configuration the user is active
on.
A functional device (e.g., Profiset) is a passive conference member
and therefore can not activate features and functions while in a conference.