Command Reference Guide

3Com Router 5000 Family and Router 6000 Family isdn ignore hlc ● 183
Command Reference
isdn ignore hlc
Purpose Use the isdn ignore hlc command to disable ISDN to carry the higher layer
compatibility (HLC) information element in the SETUP messages sent when placing
voice calls.
Use the undo isdn ignore hlc command to configure ISDN to carry the HLC
information element in SETUP messages.
Syntax isdn ignore hlc
undo isdn ignore hlc
Parameters None
Default By default, HLC information element is carried in SETUP messages when placing voice
calls.
Example 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
View This command can be used in the following views:
■ ISDN Interface view
Description 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.