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	Usage tips
Enabled	Whether this port may be used to make and receive ISDN calls.
Leased line group	Indicates the number of the leased line group.	You can configure a maximum of five numbered leased line groups. Each group is a collection of contiguous B-channels for that port.
Start channel	Select the lowest numbered B-channel that will be in this leased line group.	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.
Number of channels	Select the number of B-channels that will be in this leased line group.	Setting this to 0 means that this leased line group is not used.

	ISDN GW 3241
	host: isdngw

Configuring ISDN ports settings in leased line mode

Port settings

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