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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).
Hotline

Hotline

This service functions in this way: If the user who registers this service does not dial a number in a specified period (such as 5s) after picking up the phone, the system automatically connects this user to a fixed number (hotline number).

Hotline

This topic describes the definition and benefits of the hotline service.

Definition
This service functions in this way: If the user who registers this service does not dial a number in a specified period (such as 5s) after picking up the phone, the system automatically connects this user to a fixed number (hotline number). The hotline service can be classified into ordinary hotline and immediate hotline according to the no-dial interval.
  • Ordinary hotline: Also called delay hotline. If the user does not dial a number in a specified period after picking up the phone, the system automatically connects this user to the hotline number.
    NOTE:
    The delay hotline duration can be configured when configuring the service data.
  • Immediate hotline: After the user picks up the phone, the system automatically connects this user to the hotline number.
Benefit
Beneficiary Benefits

Carrier

The hotline service enriches user experience and enhances carriers' competitiveness.

User

When a user cannot dial the called number, the system automatically connects this user to a preset number to prevent unexpected events. This also saves the user from the trouble of dialing the called number again.

Standards Compliance

ETSI TS 183 010

3GPP TS 24610

Hotline Service Flow

This topic takes service user A and common user B as an example to describe the hotline service flow.

POTS User Hotline Service Flow

Figure 1-76 shows the service flow of the POTS user hotline service.

Figure 1-76 POTS user hotline service flow
The hotline service flow is as follows:
  1. User A (service party) picks up the phone and calls user B.
    NOTE:

    * For the immediate hotline service, after a user picks up the phone, the dial tone is not played and a call is initiated immediately. For the delay hotline service, after a user picks up the phone, the dial tone is played. A hotline call is initiated if the user does not dial a number after the delay timer expires.

  2. AG1 initiates a call to user B. The Invite message carries user B's number. AG2 receives the user A's call initiated by the IMS.
  3. AG2 sends a ring tone to user B.
  4. After user B's phone rings, AG2 sends a 180 response to user A. After receiving the 180 response message from the IMS, AG1 plays the ringback tone to user A.
  5. AG1 sends a PRACK message to AG2.
  6. AG1 receives the PRACK responses from AG2 and the IMS.
  7. User B picks up the phone.
  8. After detecting that user B picks up the phone, AG2 sends a 200 message to AG1.
  9. After receiving the 200 message from the IMS, AG1 returns an Ack message to AG2. Then, a call is set up between users A and B.
  10. User A hangs up after the call ends.
  11. After detecting that user A hangs up, AG1 sends a Bye message, asking the IMS to release the call. After receiving the BYE message, the IMS sends a Bye message to user B (called party) and releases the call.
  12. After receiving the Bye message, AG2 releases the call and returns a 200 OK response to the IMS. AG1 receives a 200 OK response to the Bye message. The call is released.
NOTE:

The service flow of the ISDN user hotline service is similar to that of the POTS user hotline service.

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Updated: 2019-02-22

Document ID: EDOC1100067358

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