3Com NBX 100 Administrator's Manual page 189

Table 32 Add Line Card Port Fields (continued)
Field
AutoExt
Time Out
Silence Suppression
Trunk to Trunk
Configuring and Managing Analog Line Card Ports
Purpose
Specify the Attendant Console extension or 500. (The
default is 500 if you leave this box empty.)
Auto Ext works with the Button Mappings feature,
which lets you map CO lines directly to Access buttons
on individual telephones and determine the destination
path for an incoming call on this line. See
details.
Specify the time, in seconds, after which this line goes
to the Attendant Console.
If you enable silence suppression, the system transmits
fewer packets during a conversation. However, silence
suppression results in compromises to audio quality.
The silence suppression setting for each port works in
conjunction with the system-wide silence suppression
setting.
If you select Default, this port operates under the
control of the system-wide Silence Suppression control.
(Default is followed by either On or Off to indicate the
current setting of System-wide Silence Suppression.)
Select On or Off to override the system-wide setting.
With Silence Suppression enabled, the line card port
detects silence in the audio stream, such as a pause in
conversation, and sends no packets. This reduces
network traffic during silences in conversations.
The receiving NBX telephone generates white noise for
the periods represented by silence indicator packets. A
careful listener might notice the difference between
generated and actual background noise.
Select Unrestricted to enable incoming calls to be
transferred to another line card port.
For example, enable Trunk to Trunk transfers if you plan
to connect a Voice Over IP (VOIP) gateway to a line card
port and let callers use the NBX system to access the
telephone system from a remote location and use it to
make CO calls.
Select Restricted to prevent transfers from one line card
port to another. For example, disable Trunk to Trunk
transfers if you are concerned about whether a caller
might use this feature to avoid normal toll charges.
If a telephone is locked, the user cannot make a Trunk
to Trunk transfer.
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Table 33
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