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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).


The virtual access gateway (VAG) is a solution in which one AG device can be simulated into multiple AG devices. Different VAGs can connect to different IMSs/softswitches, as shown in Figure 1-14. The purposes of the VAG are as follows:
  • Differentiated service

    Simulate multiple logical AGs on a physical AG, and enable different logical AGs to connect to different customer groups. In this way, different convergence ratios(Convergence ratio indicates the ratio between the sum of DSP channel resources and DSP resources concurrently occupied by the supported users.) are provided for different customer groups to meet the identified service requirements.

  • Virtual operation

    In the AG networking application, certain small-scale operators do not buy independent AG devices, but rent the AG devices from other operators to provide the service. For the renters, they may rent out a device to multiple operators to improve the device utilization rate. Simulate multiple logical AGs on a physical AG, and enable different logical AGs to connect to different softswitches. In this way, the wholesale service requirements can be met.

  • Sharing load on the IMS/softswitch

    One IMS/softswitch has limited capacity. If subscribers connected to different VAGs are distributed to multiple IMS/softswitches, the workload on one IMS/softswitch becomes lighter.

Figure 1-14 VAG networking
The VAG call process and the traditional call process are similar. The main differences are as follows:
  • The DSP distributes resources. After a subscriber picks up the phone, the AG applies for DSP resources. If DSP resources are assigned to the VAG, the VAG obtains DSP resources from the shared resource pool. If DSP resources are not assigned to the VAG, the VAG obtains DSP resources from the exclusive resource pool.
  • The IP addresses in the IP packets during the connections and conversations of the subscribers under the same VAG are the media IP address corresponding to the VAG.

Each VAG can be configured and managed independently. For the softswitch, each VAG is an independent AG, and can be configured with related attributes separately, such as authentication, ringing mapping, and terminal layered mode. When configuring a subscriber, specify a VAG for the subscriber. Subscribers under different VAGs can share the same terminal ID. The total number of subscribers configured on all VAGs cannot exceed the maximum number configured in the system.

To configure a VAG, add a VAG interface (MG interface), and enter the VAG interface mode to configure interface parameters by running commands. Each VAG can be configured with independent signaling IP address and media stream IP address (the signaling IP address and media stream IP address in the same VAG can be different) in different VLANs.

Updated: 2019-02-22

Document ID: EDOC1100067358

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