Instruction manual

Page 1588 of 3156 Group Call
553-3001-306 Standard 10.00 January 2002
Each Multiple Appearance, MCR/MCN DN reduces the number of telephone
sets that can be added to a Group Call. For example, if two telephones have
the same MCR appearance of a DN, the number of telephones in the Group
Call becomes 19. That is, each appearance of a DN counts as one member, up
to a maximum of 20, of the Group Call.
Note: Multiple Appearance, SCR/SCN DNs count as one member of a
Group Call, irrespective of its number of DN appearances.
Groups are defined through Service Change in LD 18. When a group is
defined, each member of the group is assigned a member number. If network
or conference blocking is encountered, members are assigned priorities for
connection to the Group Call in the order of their group member numbers
(member 0 has the highest priority). It is recommended that group members
be assigned from different network loops to minimize the possibility of
network blocking.
The Group Call key is used to originate a Group Call to all members of the
group to which the Group Call key is assigned. The Group Call key for a
given group can appear on more than one telephone. More than one Group
Call key can be assigned to a group, but only one Group Call key can be active
for a given group at any time. A telephone with a Group Call key need not be
equipped with a Directory Number (DN) that is defined as a group member.
Activation of a Group Call key originates a call to all assigned members of
the group. When the first member of the group answers, ringback tone is
removed and a speech path is set up between the member and the originator
of the call. As subsequent members answer, they are added to the call. The
lamp associated with the Group Call key at the originator’s telephone flashes
until all members of the group have answered the call.
If a Directory Number (DN) is actively engaged in a call and a Group Call is
originated for that DN, either the Group Call is camped on or Call Waiting is
activated for the DN and a special warning tone is provided. The special
warning tone consists of three rapid bursts of tone followed by 10 seconds of
silence, then an additional three rapid bursts of tone.
An active Group Call is under complete control of the originator of the call.
If the originator goes on hook, the call is completely broken down. Members
who are taking part in a Group Call can disconnect from the call at any time,
but once disconnected, they cannot be reconnected.