What are Centrex groups and enterprises of the AR router

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The Central Exchange (Centrex), also called group, is part of a telephone exchange or a function of the telephone exchange. The Centrex groups some users on a PBX, and provides various functions of user-specific exchange and other special services for the user group. A user group does not have a dedicated exchange. Internal and external switching is performed in the telephone exchange.
The Centrex function applies to organizations or departments with centralized employees, and scenarios in which user extensions are located dispersedly. The Centrex function provides flexible networking, and allows you to easily increase or decrease the capacity. Organizations and departments that use the Centrex function can enjoy specialized services in addition to services on the PSTN.
Each user in a Centrex group has two numbers, a private number and a long number. Users in the same Centrex group can dial private numbers to call each other. The priority of private numbers is the highest. Users in a group dial private numbers by default. A user in the Centrex group must dial the call prefix when calling a user outside the Centrex group. Centrex is an important attribute of group users. When configuring or modifying Centrex user attributes, specify the Centrex number.
An enterprise has one or more Centrex groups. Each Centrex group belongs to only one enterprise. Users in an enterprise can choose to join a Centrex group or not. Users in an enterprise can call each other, but cannot call users of another enterprise.

Other related questions:
What are groups and enterprises
The central exchange (Centrex), which is also called group, is a function of telephone exchange. The Centrex groups some users on a private branch exchange (PBX), and provides various functions of a user-specific exchange and other special services and functions to the user group. A user group does not have a dedicated exchange. The internal and external switching of users takes place inside the telephone exchange. Therefore, the Centrex is also called central user exchange or virtual user exchange. The group function is not only applicable to enterprises or departments with lots of employees, but also applicable to scenarios in which user extensions are widely dispersed. The group function provides flexible networking, and makes it easy to increase or decrease network capacity. Enterprises and departments that use the group function can enjoy specialized services in addition to services on the Public Switched Telephone Network (PSTN). Group users have two numbers. One is an internal number which is called the private number. The other is an external number which is called the long code. Users in the same group can dial private numbers to call each other. The private numbers have the highest priority. Users inside a group dial private numbers by default. If a user inside a group wants to call an external user, the user must first dial the call prefix of the group that the external user belongs to. The group ID is an important property of group users. You must specify the group ID to configure group users or modify group properties. The range of the enterprise function is larger than that of the group function. A group can only belong to an enterprise. Users inside an enterprise can belong to any groups, or not belong to a group. Users inside an enterprise can call each other, but cannot call users of another enterprise. The group and enterprise functions group users on the service layer. The DN set function groups numbers on the switch layer.

How to use the Centrex group service on the U1980?
The U1900 series voice gateway does not support the Centrex group service.

Can I configure the Centrex group service on the U1981?
The U1900 series voice gateway does not support the Centrex group service.

Link group configuration scenario of an AR router
The link-group command is used to create a link group in the SPR and access the link group view. In actual application, link requirements vary with services. To facilitate link deployment and reuse, add the links into a group, and apply services to the link group to implement link selection. The use of the link group needs to be supported by the smart policy routing parameters, and ACLs that differentiate service flows. For details about the configuration, see the URL: Example for Configuring SPR.

How to configure interface groups on AR routers
If users need to perform the same configuration on multiple Ethernet interfaces, they can add the Ethernet interfaces into an interface group. Users only need to run the configuration command of a function once in an inteface group view to configure the function for all Ethernet interfaces included in the interface group. In this way, interfaces can be configured in batches and repeated configurations are reduced. Interfaces can be added into two types of interface groups: permanent interface groups and temporary interface groups, which have the same function. However, a temporary group is automatically deleted by the system after you quit the view of the temporary interface group. Configure a permanent interface group as follows: [Huawei] port-group portgroup1 [Huawei-port-group-portgroup1] group-member ethernet2/0/0 to ethernet2/0/1 //Add interface Eth2/0/0 and interface Eth2/0/1 to the interface group portgroup1. Configure a temporary interface group as follows: [Huawei] port-group group-member ethernet2/0/0 to ethernet2/0/1 //Add interface Eth2/0/0 and interface Eth2/0/1 to a temporary interface group. AR550 series products do not support interface groups.

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