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Voice Feature Guide 01

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H.248/MGCP Dual Homing

H.248/MGCP Dual Homing

Dual homing is an NGN (Next Generation Network) total solution. Based on this solution, when the active softswitch or the link from the MG to the active softswitch is faulty, the MG need be switched to the standby softswitch immediately to prevent call services of users connected to the softswitch and the MG from being affected.

Dual homing requires that one MG is configured with two softswitches, one active and one standby. The connection between the MG and the softswitch is detected through the heartbeat message.

Figure 1-158 illustrates the working principle of dual homing.

Figure 1-158 Working principle of dual homing

  1. The MG detects the interrupted connection between the MG and the active softswitch through the heartbeat message.
  2. The MG registers with the standby softswitch.
  3. The MG sends the detection messages to the active softswitch at regular intervals (same as common heartbeat intervals), If the MG receives the response from the active softswitch, it indicates that the communication with the active softswitch is recovered. In this case, the MG takes the next action. If receiving no response from the softswitch, the MG keeps sending the detection messages.
  4. The MG sends a message to the standby softswitch for service cancellation and waits for the response from the softswitch.
  5. After receiving the response from the standby softswitch, the MG starts to register with the active softswitch. If three consecutive attempts of registration fail, the MG registers with the standby softswitch again following the same procedure.

Different carriers may choose the following different dual homing policies:

  1. When the original active softswitch recovers, the MG automatically switches to the original active softswitch.
  2. The MG does not support the auto-switching. Regardless of whether the MG registers with the active softswitch or the standby softswitch, if the softswitch with which the MG registers is normal, the MG works with this softswitch all along. The MA5600T/MA5603T/MA5608T can support the preceding two policies through related configuration. By default, the MA5600T/MA5603T/MA5608T supports the second policy.
Updated: 2019-02-22

Document ID: EDOC1100067358

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