Feature and Technical Overview

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Holding and resuming a call on a BlackBerry device

  1. A BlackBerry Mobile Voice System user is on a call that uses the SIP line call leg. On the BlackBerry device, the user presses the Menu key and clicks Hold.
  2. The BlackBerry MVS Client creates a hold request. One of the following events occurs:
    • If the user is in a wireless coverage area where data services are not available, the BlackBerry MVS Client uses DTMF tones to send the hold request to the PBX over the wireless network. The PBX converts the DTMF tones to KPML and sends the KPML to the MVS Session Manager.
    • If the user is in a wireless coverage area where data services are available, the BlackBerry MVS Client compresses and encrypts the hold request, and sends it to the wireless network. The BlackBerry Enterprise Server decrypts and decompresses the hold request, and sends it to the MVS BlackBerry Enterprise Server Connector. The MVS BlackBerry Enterprise Server Connector sends the request to the MVS Session Manager.
  3. The MVS Session Manager places the SIP line call leg into a hold state through the PBX. The hold state includes music on hold if your organization's telephony infrastructure is configured for music on hold. If the BlackBerry MVS user makes another call, the MVS Session Manager reuses the SIP line leg to make the call.

  4. On the BlackBerry device, the BlackBerry MVS user presses the Menu key and clicks Resume.
  5. The BlackBerry MVS Client creates a resume request. One of the following events occurs:
    • If the user is in a wireless coverage area where data services are not available, the BlackBerry MVS Client uses DTMF tones to send the resume request to the PBX over the wireless network. The PBX converts the DTMF tones to KPML and sends the KPML to the MVS Session Manager. The MVS Session Manager, through the PBX, removes the hold state from the SIP line call leg, and the call can continue.
    • If the user is in a wireless coverage area where data services are available, the BlackBerry MVS Client compresses and encrypts the hold request, and sends it to the BlackBerry Enterprise Server over the wireless network. The BlackBerry Enterprise Server decrypts and decompresses the resume request, and sends it to the MVS BlackBerry Enterprise Server Connector. The MVS BlackBerry Enterprise Server Connector sends the request to the MVS Session Manager. The MVS Session Manager, through the PBX, removes the hold state from the SIP line call leg, and the call can continue.

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