3Com 3C10402B, Руководство администратора

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Multicast Addresses 43
Multicast Addresses
The system uses IP multicast addressing to distribute information for
these system features, which are available on Layer 2 and Layer 3 IP
devices:
■
Mapped line appearances
■
Internal pages
■
External pages
■
Conference calls
The Music on Hold (MOH) feature is available on Layer 2 devices only. The
IP implementation uses Internet Group Management Protocol (IGMP)
to transmit and distribute the necessary data and audio.
If you configure your system to use IP On-the-Fly or Standard IP and your
switches use IGMP Snooping, you must have an IGMP Host on the
network. Typically, an IGMP Host is an IP Multicast Router or a switch that
has IGMP Query capability.
TAPI Line
Redirect
Timeout The length of time before a call redirected from a TAPI route point
by an external application returns to its original destination. After
two failures, the call goes to the TAPI route point’s call coverage
option.
TAPI Line Redirect allows an external TAPI application, typically a
call center application, to reroute incoming calls based on caller ID
information automatically.
For more information, see TAPI Route Points .
Camp On
Timeout The length of time that a call can camp on a busy extension before
the system returns the call to the extension that initiated the Camp
On feature.
The Camp On Timer can be set in increments of 10 seconds. The
default value for Camp On Timer is 180 seconds. The maximum
value that you can set the timer for is 600 seconds.
Automatic
Callback
Timeout The length of time that a call can be designated for call back
before the system cancels the call.
The Callback Timer has default value of 12 hours. You can set the
timer to have a null value. If Automatic Callback is not returned in
the specified time, Automatic Callback is cancelled. A system
reboot also cancels the Automatic Callback on an extension.
Table 12 System Timers
Field Purpose