3Com 3031 Command Reference Manual page 275

3com 3031: reference guide

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ISDN Configuration Commands

In the event that the router is communicating with an ISDN exchange, its settings

must be the same as those on the exchange.

You are not allowed to configure this command on an ISDN interface if there is still

a call on it. This command can take effect only if it is configured when there is no

call on the interface. Alternatively, you can manually disable the interface by

executing the shutdown command, configure the command, and then enable the

interface by executing the undo shutdown command. The operations, however,

will lead to the disconnection of the call existing on the interface.

Configure ISDN to carry the HLC information element in the SETUP messages for

the voice calls placed on the Bri interface 0/0/0.

[3Com-Bri0/0/0] isdn ignore hlc

isdn ignore llc

isdn ignore llc

undo isdn ignore llc

ISDN interface view

Using the isdn ignore llc command, you can disable ISDN to carry the Lower Layer

Compatibility (LLC) information element in the SETUP messages sent when placing

voice calls. Using the undo isdn ignore llc command, you can configure ISDN to

carry the LLC information element in SETUP messages.

By default, LLC information element is carried in SETUP messages when placing

voice calls.