Configuring Isdn Ports Settings In Leased Line Mode; Port Settings - Cisco TELEPRESENCE ISDN GATEWAYS 2.0 Online Help Manual

Configuring ISDN ports settings in leased line
mode
These settings affect the per-port ISDN configuration of the ISDN gateway when it is leased line
mode. Use these settings to enable the ports and to configure leased line groups. To access these
settings, go to Settings > ISDN ports.
In leased line mode, there is no way to dynamically decide how many B-channels to use in a call
(because that requires the D-channel); instead, both devices must be set up with the same "leased
line groups". In this way, a number of B-channels are grouped together and are used simultaneously
as a pipe for audio and video data.
Refer to the table below for information about the settings. After making changes, click Apply
changes and then restart the ISDN gateway for the changes to leased line groups to take effect.

Port settings

Field
Field description
Enabled Whether this port may be used to
make and receive ISDN calls.
Leased line Indicates the number of the leased line
group
group.
Start channel Select the lowest numbered B-channel
that will be in this leased line group.
Number of
Select the number of B-channels that
channels will be in this leased line group.
Cisco TelePresence ISDN Gateways v2.0 Online help (Printable format)

Configuring ISDN ports settings in leased line mode

Usage tips
You can configure a maximum of five
numbered leased line groups. Each
group is a collection of contiguous B-
channels for that port.
The B-channels that you select must be
in contiguous blocks and not span PRIs.
The B-channels that you configure for
this group on the ISDN gateway must
match exactly the groups configured on
the leased line to which it is connected.
For each PRI you can use B-channels
1-31 in E1 mode and 1-24 in T1 mode.
Setting this to 0 means that this leased
line group is not used.
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