Information Technology Reference
In-Depth Information
Intercom
The Intercom feature allows a button to be configured that calls an intercom line on an-
other phone. The recipient phone auto-answers in speakerphone mode, with the micro-
phone muted. A one-way audio stream now exists from the caller to the recipient; the
recipient can hear the caller, but the caller cannot hear the recipient. This is known as
Whisper Intercom
.
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When the recipient presses their Intercom button, a second one-way audio stream is es-
tablished back to the caller and they can each hear the other. For both these intercom
calls, an auto-answer tone is heard when the recipient phone answers the call.
If the recipient is in a call when the Whisper Intercom call is made, the recipient hears the
one-way audio from the intercom caller, but the other party does not.
Intercom lines are different from normal DNs. Intercom lines cannot call DNs, and DNs
cannot call intercom lines. Intercom lines have their own dial plan and permissions (Inter-
com Partitions and CSS). An Intercom button can be a speed dial (with one preconfigured
target intercom line), or you can configure an Intercom button that requires the user to
dial the target intercom line.
CUCM Native Presence
Presence can be defined as “signaling one's capability and willingness to communicate.”
Presence indications can include Instant Messaging status indications, such as Online,
Offline, Busy, Out to Lunch, In a Call, and so on, or in a telephone system, simply On
Hook or Off Hook. CUCM supports a built-in capability to track the on or off hook sta-
tus of a DN.
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Presence status can be monitored using either a Busy Lamp Field (BLF) speed dial or Pres-
ence-enabled call and directory lists. A BLF Speed Dial is a speed dial button that lights
up when the target of the speed dial is off hook. Presence-Enabled Call Lists display an
icon that indicates that the entry in the list is one of the following:
Unknown:
The entry is not being watched, or the device displaying the list does not
have permission to watch the target's presence status. The icon displayed is a blank
phone keypad.
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On Hook:
The entry is on hook. The icon displayed is a telephone over a blank keypad.
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Off Hook:
The entry is off hook. The icon displayed is two handsets over a blank
keypad.
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Figure 11-8 shows an IP Phone displaying a Presence-Enabled Call List with each of the
three icons showing the current status of the targets of recent placed calls. In the figure,
85122001 and 3001 display Unregistered status, 2002 is Off Hook, and 2001 is On Hook.
Presence Architecture
In some cases, it may not be desirable to have every phone watch every DN in the system.
Presence visibility can be controlled in the following ways:
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BLF Speed Dials can be configured only by an administrator; users cannot create or
edit their own.
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