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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).
Callback

Callback

When user A calls user B and user B is busy or does not answer the call, the AG automatically sets up a call if the user has subscribed to the callback service and meets the callback conditions. The callback service includes the Completion of Calls to Busy Subscriber (CCBS) and Completion of Communication on No Reply (CCNR) services.

Callback

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

Definition

The callback service includes the Completion of Calls to Busy Subscriber (CCBS) and Completion of Communication on No Reply (CCNR) services.

The following describes the CCBS service: When user A (calling party) calls user B (called party) and user B is busy, user A can activate the CCBS service if user A has registered the service. When user B is idle, the AG automatically calls users A and B back to set up a call.

Assume that user A has subscribed to the CCBS service, and user B is a common user. Figure 1-82 shows the schematic diagram.
Figure 1-82 Schematic diagram of the CCBS service
  1. User A calls B. User B is busy.
  2. User A activates the CCBS service and hangs up.
  3. User B becomes idle after a call ends.
  4. User A picks up the phone after the phone rings.
  5. User B picks up the phone after the phone rings. User A talks with user B.

The following describes the CCNR service: When user A (calling party) calls user B (called party) and user B does not answer the call, user A can activate the CCNR service if user A has registered the service. When user B is idle, the AG automatically calls users A and B back to set up a call.

Assume that user A has subscribed to the CCNR service, and user B is a common user. Figure 1-83 shows the schematic diagram.
Figure 1-83 Schematic diagram of the CCNR service
  1. User A picks up the phone and calls user B. User B does not answer the call.
  2. User A activates the CCNR service and hangs up.
  3. User A picks up the phone after the phone rings.
  4. User B picks up the phone after the phone rings. User A talks with user B.
Benefit
Beneficiary Benefits

Carrier

The callback service improves the connection rate, enriches user service experience, enhances the carrier's competitiveness, and adds value to carrier services.

User

After the calling party activates the CCBS or CCNR service, the AG automatically detects the network status of the called party, which facilitates the calling party and improves user experience.

Implementation

The call back service does not require service logic or device configuration. Voice users can use the basic call service only after subscribing to it.

Standards Compliance
  • ETSI TS 300 359
  • ETSI TS 124 642
  • ETSI TS 183 036

Callback Service Flow

This topic takes user service A and common user B as an example to describe the callback service flow, including the Completion of Calls to Busy Subscriber (CCBS) and Completion of Communication on No Reply (CCNR) service flows.

ISDN CCBS Service Flow

Figure 1-84 shows the service flow of the ISDN CCBS service.

Figure 1-84 ISDN CCBS service flow

User A is a callback service user. User A calls user B, and user B is busy. The service flow of activating the CCNR service by an ISDN user is as follows:
  1. User A picks up the phone and calls user B.
  2. AG1 sends an Invite message to user B.
  3. The IMS sends an Invite message to user B.
  4. AG2 replies with an Invite-486 message when user B is busy.
  5. After detecting that user A has the CCBS service permission, the IMS sends an Invite-183 message to ask user A to activate the CCBS service.
  6. After receiving the Invite-183 message, AG1 asks user A to activate the CCBS service. After receiving an Alert message, A enters the CCBS activation code.
  7. After user A activates the CCBS service, the IMS sends an Invite-486 message to AG1, indicating that the call cannot be connected.
  8. AG1 sends a Disconnect message to user A, asking user A to release the call.
  9. AG1 returns an Ack message in response to the Invite-486 message sent from the IMS.
  10. A hangs up and releases the call.
  11. AG1 confirms that the call is released.
ISDN CCNR Service Flow

Figure 1-85 shows the service flow of the ISDN CCNR service.

Figure 1-85 ISDN CCNR service flow

User A is a callback service user. User A calls user B, and user B does not answer the call for a long time. The service flow of activating the CCNR service by an ISDN user is as follows:
  1. After detecting that user A has the CCNR service permission, the IMS sends an Invite-183 message to ask user A to activate the CCNR service.
  2. AG1 asks user A to activate the CCNR service.
  3. After user A activates the CCNR service, the IMS sends an Invite-486 message to AG1, indicating that the call cannot be connected.
  4. AG1 sends a Disconnect message to user A, asking user A to release the call.
  5. AG1 returns an Ack message in response to the Invite-486 message sent from the IMS.
  6. A hangs up and releases the call.
  7. AG1 confirms that the call is released.
NOTE:
The service flow of the POTS user callback service is similar to that of the ISDN user emergency call service.
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Updated: 2019-02-22

Document ID: EDOC1100067358

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