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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 Call

Emergency Call

A user can make an emergency call if the connected port is in remote block state and the SIP proxy server is normal and the dialed number matches the emergency digitmap.

Emergency Call

This topic describes the definition and benefits of the emergency call service.

Definition

When the user port is in the remote blocking state and the SIP proxy server is normal, if the number matches the emergency call digitmap, the emergency call can be initiated by dialing the emergency call numbers such as 110, 120, and 119.

Benefit
Beneficiary Benefits

Carrier

The emergency call service brings added value and provides users with help in an emergency, improving user satisfaction.

User

Users can quickly dial preset emergency numbers in an emergency to help customers cope with the situation.

Emergency Call Service Flow

This topic takes user A as an example to describe the emergency call service flow.

POTS Emergency Call Service Flow

Figure 1-75 shows the emergency call service flow for POTS users.

Figure 1-75 Emergency call service flow for POTS users

This service flow is similar to a basic call flow. The differences are as follows:
  • The service port may be in the remote blocking state (the proxy is normal). If the number matches the emergency digitmap, the call can be initiated.
  • The initial Invite message carries the Priority and Resource Priority header fields, and the content is emergency.
  • If the called party is in the remote blocking state (the proxy is normal), the system checks the content of the Priority and Resource Priority header fields. If the content is emergency, the call is allowed.
NOTE:

The emergency call service flow for ISDN users is similar to the emergency call service flow of a POTS user.

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Updated: 2019-02-22

Document ID: EDOC1100067358

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