4000 Router Series Layer 2 - WAN Command Reference

Syntax

isdn crlength call-reference-length

undo isdn crlength

Default

The call reference length is 2 bytes for CE1/PRI and CT1/PRI interfaces and 1 byte for BRI interfaces.

Views

ISDN interface view

Predefined user roles

network-admin

Parameters

call-reference-length: Specifies the ISDN call reference length, taking a value of 1 or 2 bytes.

Usage guidelines

Call reference is equal to the sequence number that the ISDN protocol assigns to each call, 1 or 2 bytes

in length and can be used cyclically.

The router automatically identifies the call reference length when receiving a call from a remote device.

However, some devices on the network do not have such capability. If the router is required to place calls

to such a device connected to it, you must configure the same call reference length the router uses as that

configured on the connected device.

Do not configure this command on an ISDN interface on which a call still exists.

Examples

# Set the call reference length carried by ISDN messages on PRI interface Serial 1/0:15 to 1 byte.

<Sysname> system-view

[Sysname] interface serial 1/0:15

[Sysname-Serial1/0:15] isdn crlength 1

isdn ignore connect-ack

Use isdn ignore connect-ack incoming to configure the ISDN protocol to switch to the ACTIVE state to

start data and voice service communications after sending a CONNECT message without having to wait

for a CONNECT ACK message.

Use isdn ignore connect-ack outgoing to configure the ISDN protocol to switch to the ACTIVE state after

receiving a CONNECT message without having to send a CONNECT ACK message.

Use isdn ignore connect-ack to configure the ISDN protocol to switch to the ACTIVE state after receiving

or sending a CONNECT message without having to wait for or send a CONNECT ACK message.

Use undo isdn ignore connect-ack incoming or undo isdn ignore connect-ack outgoing to restore the

default way of handling sent or received CONNECT messages.

Use undo isdn ignore connect-ack to restore the default ways of handling both sent and received

CONNECT messages.

Syntax

isdn ignore connect-ack [ incoming | outgoing ]

undo isdn ignore connect-ack [ incoming | outgoing ]