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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).
Call Forwarding

Call Forwarding

The call forwarding (CF) service is a callee-side service. If a user has subscribed to the CF service and the call flow meets the call forwarding conditions, the call is forwarded to the preset forwarded-to party.

Call Forwarding

This topic describes the definition and benefits of the call forwarding (CF) service.

Definition
The CF service is a service on the terminating side. If a user has subscribed to the CF service and the call flow meets the call forwarding conditions, the call is forwarded to the preset forwarded-to party. Currently, the system supports the following call forwarding services:
  • CFU: a terminating-side service that enables a service user to unconditionally forward all incoming calls to a preset forwarded-to number.
  • CFB: a terminating-side service that enables a user to forward all incoming calls to a preset forwarded-to number when the user is busy on another call.
  • CFNR: a terminating-side service that a user to forward all incoming calls to a designated forwarded-to number if the calls are not answered within a preset period.
Benefit

Beneficiary

Benefits

Carrier

The CF service enriches users' service experience, improves the network connection rate, and provides value-added services for carriers.

User

The CF service enables users to flexibly set the CF type to facilitate the selection of the terminal and the occasion for answering the calls and to avoid missing calls.

Standards Compliance
  • ETSI 300 102-1
  • EN300 207
  • ETSI TS 124 504
  • ETSI TS 183036
  • ETSI TS 183043
  • ITU-T Q.931

Call Forwarding Service Flow

This topic describes the call forwarding (CF) service flow for POTS users and ISDN users.

CF Service Flow for POTS Users

Figure 1-72 shows the call forwarding service flow for POTS users.

Figure 1-72 CF service flow for POTS users

The CF service flow is as follows:
  1. User A picks up the phone.
  2. User A hears a dial tone.
  3. User A reports the number information.
  4. AG1 sends an Invite message to the IMS.
  5. The IMS sends the 100 trying temporary response message.
  6. The IMS sends the Invite message from user A.
  7. AG2 determines that the current user meets the call forwarding conditions and returns a 302 message in which the Connect header field carries the forwarded-to number.
Then, the IMS initiates a call forwarding based on the forwarded-to number in AG2 response.
CFU Service Flow for ISDN users

Figure 1-73 shows the call forwarding unconditional (CFU) service flow for ISDN users.

Figure 1-73 CFU service flow for ISDN users

User A is a call forwarding service user. When user A receives a call from user B, the call is forwarded unconditionally to C without passing through user A. The CFU service flow is as follows:
  1. The non-service user B initiates a call to service user A and sends a Setup message.
  2. AG2 converts the Invite message and sends it to the IMS.
  3. After receiving the message, the IMS determines and triggers the CFU service logic, and returns a 181 message carrying the P-Notification:Call is diverting notification to user B. The History-Info or Diversion header field is optional, and the call forwarding information is recorded.
  4. AG2 converts the 181 message into an ISDN Alert message, carries the notification information unit, and generates the RedirectionNumber information unit on the ISDN side based on the History-Info or Diversion header field.
  5. The IMS forwards the Invite message to user C based on the configuration. The Invite message carries the History-Info or Diversion header field and records the forwarding information.
  6. AG2 converts the received Invite message into an ISDN Setup message and generates an ISDN RedirectionNumber information unit based on the History-Info or Diversion header field.
  7. The forwarded-to party answers the call and sends a Connect message.
NOTE:

The subsequent service flow is the same as the basic call flow. After the call is answered, non-service users B and C enter the conversation state.

CFB Service Flow for ISDN Users

The busy status in the call forwarding busy (CFB) service can be determined either by the IMS or the AG. When determined by the IMS, the CFB service flow is the same as the CFU service flow, except that the conditions for triggering the call forwarding flow are different. Figure 1-74 shows the call forwarding flow when the AG determines that the call is busy.

Figure 1-74 CFB service flow for ISDN users

User A is the CFB service party. The CFB service flow for ISDN users is as follows:
  1. The non-service user B initiates a call to user A and sends a Setup message.
  2. AG2 converts the Invite message and sends it to the IMS.
  3. The IMS does not determine whether user A is busy, and sends the Invite message to AG1.
  4. AG1 determines that user A is busy and sends a 486 response to the Invite request.
  5. After receiving the 486 response, the IMS determines that the CFB condition is met and starts the call forwarding flow.
The subsequent flow is the same as that described in CFU Service Flow for ISDN users.
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Updated: 2019-02-22

Document ID: EDOC1100067358

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