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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).
Carrying Value-added Service Flows of IP Z Interface Extension

Carrying Value-added Service Flows of IP Z Interface Extension

The IP Z interface extension feature supports value-added services that include call waiting and three-way calling (3WC). The following uses 3WC as an example to describe how the value-added service is carried using the IP Z interface extension feature. Figure 1-126 shows the service flow.

Figure 1-126 Flow of carrying the 3WC service through IP Z interface extension

The flow of carrying the 3WC service through IP Z interface extension is as follows:
  1. A call has been set up between user A and user B.
  2. User B needs to communicate with user C and therefore presses the hookflash. MSAN_2 detects the hookflash message, encapsulates the message as an RFC2833 packet, and sends the packet to the FXO board of MSAN_1. MSAN_1 restores the hookflash message from the RFC2833 packet and sends the message to the PBX.
  3. After receiving the hookflash message, the PBX transparently transmits the dial tone to user B. After hearing the dial tone, user B starts to dial the number of user C. The dialed number is transparently transmitted to the PBX.
  4. After collecting the number, the PBX plays the ringing tone to user C and plays the ringback tone to user B.
  5. User C picks up the phone. The call is established between user B and user C.
  6. User B presses the hookflash again. MSAN_2 sends the hookflash signal to MSAN_1 through RFC2833. MSAN_1 informs the PBX of user B's hookflash pressing.
  7. After receiving the hookflash message, the PBX transparently transmits the dial tone to user B. After hearing the dial tone, user B starts to dial the DTMF number 3. The dialed number is transparently transmitted to the PBX. By now, the 3WC is established between users A, B, and C.
NOTE:
During the time from user B pressing the hookflash for the first time to user B pressing the hookflash for the second time and dialing the DTMF number 3, user A is in the call waiting state.
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Updated: 2019-02-22

Document ID: EDOC1100067358

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