4000 Router Series Voice Configuration Guide

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subinterfaces, but you can use the display voice subscriber-line line-number.subnumber command

to view the call state of a subinterface.

Configuring a BRI interface

Step Command Remarks

1. Enter system view.

system-view N/A

2. Enter BRI interface view.

interface bri interface-number N/A

3. (Optional.) Configure a

description for the interface.

description text

The default is interface name

Interface.

4. (Optional.) Enable loopback

detection for B channels.

loopback { b1 | b2 | both }

By default, loopback detection is

disabled.

5. (Optional.) Configure the

expected bandwidth of the

interface.

bandwidth bandwidth-value The default is 0 kbps.

6. Set the MTU of the interface.

mtu size The default is 1500 bytes.

7. Set the polling interval for the

interface.

timer-hold seconds The default is 10 seconds.

8. (Optional.) Restore the default

settings for the interface.

default N/A

9. Bring up the interface.

undo shutdown By default, a BRI interface is up.

10. (Optional.) Activate the

interface.

activate

By default, a BRI interface is not

activated.

For more information about these commands, see Interface Command Reference.

Configuring a digital voice interface

The description, shutdown, receive gain, transmit gain, and cng-on commands have the same functions

as those for analog voice interfaces. For more information about those commands, see related sections

in "Configuring analog voice interfaces."

Configuring a timeslot set

Creating a timeslot set

To use an E1 interface, you need to create a timeslot set and configure the signaling type, Then, the

system automatically creates a logical digital voice interface. Timeslot 0 is used for frame synchronization,

timeslot 16 is used to transmit signaling, and the other 30 timeslots are used to transmit voice packets.

A T1 interface is used in a similar way to an E1 interface, except that it has 24 timeslots and timeslot 24

is used to transmit signaling.

Only RS signaling can be configured for a timeslot set.

To create a timeslot set: