3Com 3031 Command Reference Manual page 273

3com 3031: reference guide

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ISDN Configuration Commands

undo isdn crlength

ISDN interface view

call-reference-length: ISDN call reference length, which can be one or two bytes.

Using the isdn crlength command, you can set length of the call reference used

when a call is placed on an ISDN interface. Using the undo isdn crlength

command, you can restore the default ISDN call reference length on the interface.

Call reference is equal to the sequence number that the protocol assigns to each

call. It is one or two bytes in length and can be used cyclically.

When the router receives a call from a remote device, it can automatically identify

the length of the call reference. However, some devices on the network do not

have such capability. In the event that the router is required to place calls to such a

device connected to it, you must configure the router to use the same call

reference length configured on the connected device.

By default, the call reference length is two bytes for E1 PRI and T1 PRI interfaces

and one byte for BRI interfaces.

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.

Set the call reference length carried by the ISDN messages on the PRI interface

serial0/0/0:15 to 1 byte.

[3Com-serial0/0/0:15] isdn crlength 1

isdn ignore connect-ack

isdn ignore connect-ack

undo isdn ignore connect-ack

ISDN interface view