Feature and Technical Overview

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Handoff a call from Voice over Wi-Fi to Voice over Mobile

  1. A BlackBerry Mobile Voice System user has a BlackBerry device that is configured to use the Wi-Fi as the default network and to use the mobile network when the Wi-Fi network is unavailable.
  2. During a call on a BlackBerry device using Voice over Wi-Fi, the user starts to move out of an area with Wi-Fi coverage. One of the following actions occurs:
    • If the template setting for Network handoff is set to Automatic handoff with user notification, the BlackBerry device automatically sends the request to move the Wi-Fi call to the Voice over Mobile network.
    • If the template setting for Network handoff is set to Automatic handoff with user prompt, the BlackBerry device prompts the user to confirm the request to move the Wi-Fi call to the Voice over Mobile network. If the user confirms the request, the device moves the Wi-Fi call to the Voice over Mobile network.
  3. The device starts a call move request. The device compresses and encrypts the request, and sends it to the BlackBerry Enterprise Server over the Wi-Fi network.
  4. The BlackBerry Enterprise Server decrypts and decompresses the request and sends it to the MVS BlackBerry Enterprise Server Connector.
  5. The MVS BlackBerry Enterprise Server Connector sends the request to the MVS Session Manager.
  6. The MVS Session Manager sends the request using SIP to the PBX over a UDP port.
  7. The PBX determines that the phone number is an external number and rings the mobile phone number over the PSTN.
  8. The device answers the Voice over Mobile call on behalf of the user.
  9. The MVS Session Manager instructs the PBX to change the RTP connection from the Wi-Fi network to the mobile network.

  10. The PBX switches the Wi-Fi call with the mobile call.
  11. The MVS Session Manager disconnects the Wi-Fi call, and notifies the device that the Wi-Fi call was moved. The user receives a notification that the Wi-Fi call was moved.
  12. The user continues the call on the device.

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