This object is used to reflect the desired state and echo canceler usage for ALL 30 ISDN PRI B Channels. The actual state of each B channel is given by isdnPriBChannelOperStatus. Each channel is represented by 1 octet. Channel 1 is represented by 1st octet, Channel 30 is represented by octet #30. Bits order 01234567... 00000000 - down 00000001 - up 00000010 - shuttingDown 00000011 - testing 00000100 - up with echo canceler 00000101 - testing with echo canceler 'down'- all existing calls on the channel are cleared immediately. 'shuttingDown' - no further calls shall be accepted - either incoming or outgoing on the B channel. Once any call on the B Channel has benn cleared, the value of this object moves to 'down'.