Configuring a BRA Trunk Group
A BRA trunk group implements voice communication between PBX users and inter-office users. A BRA trunk is a digital circuit trunk. If a BRA trunk is bound to a BRA interface, the BRA trunk supports a maximum of two simultaneous voice calls. If the BRA trunk is bound to multiple BRA interfaces, the number of supported voice calls is twice the number of bound BRA interfaces.
Context
If the voice interface card 2BST that supports the BRA interface or a router with a BRA interface is deployed in a PBX, the PBX can connect to the ISDN through a BRA trunk. In this case, the BRA interface must work in TE mode.
The PBX can add several trunks of the same type to a trunk group, which are invoked by call routes. Even if there is only one trunk, a trunk group needs to be configured to facilitate trunk management. BRA trunk groups use Digital Subscriber Signaling No.1 (DSS1) or QSIG as the control signaling.
The PBX connects to the ISDN through a BRA trunk group, as shown in Figure 2-28.
Configuring the Card and Interface
After the working mode of the 2BST card is configured, original service data on the 2BST card and interfaces of the 2BST card will become invalid.
Step |
Action |
Command |
Description |
|
|---|---|---|---|---|
1 |
Enter the system view. |
system-view |
- |
|
2 |
Configure the card or interface to work in NT mode. (Configure the working mode of the card or interface as required.) |
Configure the 2BST card to work in NT mode. |
set workmode slot slot-id bri bri-voice nt-mode |
After this command is executed, the system asks you whether to restart the 2BST card. If you select Y, the 2BST card restarts. If the 2BST card does not restart in this situation, run the reset slot command to restart the 2BST card. If the 2BST card works in TE mode and has BRA trunk data configured, delete the BRA trunk data after you change the working mode to NT. |
3 |
Configure a clock source for the BRA interface. |
clock source source-id [ slotid/subcardid/portid ] priority priority-value |
You are advised to configure a clock source for the trunk interface. If no clock source is configured, the main control unit transmits clock signals generated by the local crystal oscillator to other cards as the transmit reference clock. |
|
Configuring a BRA Trunk Group
Step |
Action |
Command |
Description |
|---|---|---|---|
1 |
Enter the voice view. |
voice |
- |
2 |
(Optional) Configure the mappings between ISDN cause values and SIP error codes. |
cause-mapping { isdn-cause isdn-cause-value sip-response sip-response-value } * |
- |
3 |
Create a BRA trunk group and enter the BRA trunk group view. |
trunk-group name [ bra-dss1 | bra-qsig ] |
If a BRA trunk group already exists, this command directly displays the BRA trunk group view. |
4 |
Bind a trunk to the BRA trunk group. |
trunk-bra slotid/subcardid/portid [ default-called-telno default-called-telno-value | caller-telno [ enterprise enterprise-name ] telno-value | default-cli default-cli-value | [ b-channels b-channels-value [ num num-value ] ] config-status config-status-value ] * |
You can specify default-called-telno to transmit incoming calls over a trunk to an intra-office user (dedicated access) or access number of the switchboard (switchboard access). |
5 |
(Optional) Configure the enterprise and DN set that the BRA trunk group belongs to. |
enterprise enterprise-name [ dn-set dn-set-name ] |
By default, a BRA trunk group belongs to the enterprise default and DN set DefaultDialPlan. You need to perform this step only when multiple enterprises and DN sets are configured. For details on how to configure an enterprise and a DN set, see Configuring an Enterprise and a DN Set. |
6 |
(Optional) Configure a trunk group circuit selection mode. |
select-mode selectmode-value |
The following circuit selection modes are available:
|
7 |
(Optional) Configure the default country code and area code. |
country-code country-code-value area-code area-code-value |
This command configures the country code and area code for incoming calls over a BRA trunk group. When incoming calls do not carry the country code and area code, the PBX adds the configured country code and area code so that intra-office users can view calls and call back through call display. |
8 |
(Optional) Configure the default number displayed. |
default-caller-telno telno-value |
- |
9 |
(Optional) Configure the description for the BRA trunk group. |
description desc-value |
- |
10 |
(Optional) Configure the calling number type. |
typeofnumber caller callernumber-value |
- |
11 |
(Optional) Configure the called number type. |
typeofnumber called callednumber-value |
- |
12 |
(Optional) Configure the caller number plan identify. |
num-plan-identify caller numplanidentify-value |
This step is required only when the remote device has special requirements on the numbering plan. |
13 |
(Optional) Configure the called number plan identify. |
num-plan-identify called numplanidentify-value |
This step is required only when the remote device has special requirements on the numbering plan. |
14 |
Save the configuration. |
save |
- |
Example
Create a BRA trunk group named braa, bind the BRA trunk connected to BRA interface 2/0/0 to the BRA trunk group, and set the default called number to the access number 7200. Configure a clock source for the BRA interface.
<Huawei> system-view [Huawei] set workmode slot 2 bri bri-voice te-mode [Huawei] clock source 0 2/0/0 priority 5 [Huawei] voice [Huawei-voice] trunk-group braa bra-dss1 [Huawei-voice-trunkgroup-braa] trunk-bra 2/0/0 default-called-telno 7200 [Huawei-voice-trunkgroup-braa] save
Verification
Action |
Command |
Expected Result |
|---|---|---|
Verify the BRA trunk group configuration. |
display voice trunk-group [ name [ para-value ] ] |
The parameter values in the command output are consistent with the settings. |