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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).
Emergency Standalone

Emergency Standalone

Emergency standalone is a solution in which the users on the same MG can call each other even when the interface between the MG and the softswitch/IMS is interrupted. After a user picks up the telephone, the MG (namely, the MA5600T/MA5603T/MA5608T) checks whether the interface connected the softswitch/IMS is interrupted.
  • If the interface is in the normal state, the normal softswitch/IMS process starts.
  • Otherwise, the MG checks whether emergency standalone can be enabled.
    • If yes, the MA5600T/MA5603T/MA5608T controls the call process.
    • If no, the user listens to the busy sound (because the interface is faulty and emergency standalone is not allowed).

Figure 1-162 shows the operating principle of emergency standalone.

Figure 1-162 Operating principle of emergency standalone

The emergency standalone process is as follows:
  • The service processing after the calling party picks up the telephone is as follows:
    1. The calling party picks up the telephone.
    2. The device automatically delivers the dial tone to the calling party.
    3. The calling party dials a phone number.
    4. The device analyzes the dialed number and finds out the called party on the same device. The phone number is configured for a user when the user is configured on the MG.
    5. The device delivers the ringing signal and calling party's phone number to the called party.
    6. The device delivers the ring-back tone to the calling party.
  • The service processing after the called party picks up the telephone is as follows:
    1. The called party picks up the telephone.
    2. The device stops delivering the ring-back tone to the calling party.
    3. The calling and called parties start a conversation.
  • The service processing after any party puts down the telephone is as follows:
    1. Any of the two parties puts down the telephone.
    2. The device delivers the busy tone to the other party.
    3. The other party puts down the telephone.
  • Only the unabbreviated number is supported and the Centrex group, abbreviated number message, user outgoing/incoming call authority, and various new services are not supported.
  • A user can call another user only on the same VAG.
  • The feature applies only to the VoIP user.
  • The dual-homing feature and the emergency standalone feature cannot be enabled at the same time.
  • The ISDN services do not support the function of emergency standalone when it uses the H.248 protocol.
Updated: 2019-02-22

Document ID: EDOC1100067358

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