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Voice Feature Guide 01

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H.248 Multi-homing

H.248 Multi-homing

Overview

As an enhancement of dual-homing, multi-homing is a configuration in which a media gateway (MG) is homed to the primary media gateway controller (MGC), secondary MGC, and disaster-recovery MGC.

The system supports the following configurable switching policies for multi-homing:

  1. Automatic switching back
    • An MG registering with the secondary MGC will automatically switch back to the primary MGC when the primary MGC recovers.
    • An MG registering with the disaster-recovery MGC will automatically switch back to the primary/secondary MGC when the primary/secondary recovers.
  2. No automatic switching back
    • An MG registering with the secondary MGC will not automatically switch back to the primary MGC when the primary MGC recovers.
    • An MG registering with the disaster-recovery MGC will not automatically switch back to the primary/secondary MGC when the primary/secondary MGC recovers.

Network Application

Figure 1-159 H.248 multi-homing network
  • ESA-GW: emergency standalone-gateway
  • MSAN: multi-service access node
As shown in the preceding figure, an MSAN is an MA5600T/MA5603T/MA5608T and an ESA-GW can be a small-capacity softswitch in network deployment. Generally, ESA-GWs and MA5600T/MA5603T/MA5608Ts are deployed in the same telecommunications room. When disconnected from the primary and secondary MGCs (for example, due to a fiber cut), the MA5600T/MA5603T/MA5608T initiates registration to the ESA-GW. After the successful registration, all call services of the MA5600T/MA5603T/MA5608T are controlled by the ESA-GW. In this way, the following services are still available even if the MA5600T/MA5603T/MA5608T is disconnected from the primary and secondary MGCs:
  1. Call services of users connected to the same MA5600T/MA5603T/MA5608T
  2. Call services of users connected to different MA5600T/MA5603T/MA5608Ts (homed to the same ESA-GW)
  3. Emergency call services
Pay attention to the following aspects when applying H.248 multi-homing:
  1. The call service capabilities are restricted by the ESA-GW.
  2. The callee of an emergency call (for example, police emergency call) must be connected to an MA5600T/MA5603T/MA5608T.
    NOTE:

    This limitation is a supplement to the solution shown in Figure 1-159. Whether such an limitation takes effect depends on the actual core network topology.

  3. Only the POTS users are supported (the ISDN users and other users are not supported).

Switching Process

Figure 1-160 Process of switching to the ESA-GW
Figure 1-161 Process of switching back
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Updated: 2019-02-22

Document ID: EDOC1100067358

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