Understanding BlackBerry MVS call direction

Call direction determines how the setup of the media path between the PBX and the BlackBerry device is initiated. You can configure the BlackBerry Mobile Voice System to use PBX-initiated or BlackBerry device-initiated call direction. Call direction can be configured for incoming and outgoing calls.

Understanding call direction terminology

The following are the basic terms used when discussing call direction:

  • Inbound Call: Any call made to a BlackBerry Mobile Voice System user’s DID/DDI or extension
  • Outbound Call: Any call that a BlackBerry MVS user makes
  • PBX-initiated: A call setup method that occurs when the PBX sets up a call between itself and the BlackBerry MVS user’s BlackBerry device
  • BlackBerry device-initiated: A call setup method that occurs when the BlackBerry MVS user’s BlackBerry device sets up a call between itself and the PBX
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Understanding the BlackBerry MVS call flows

The basic call direction terms are used when you describe the four basic Voice over Mobile call flows:

  • PBX-initiated inbound: A call to a BlackBerry Mobile Voice System user when the user's class of service is configured to have the PBX call the BlackBerry device for an incoming call.
  • PBX-initiated outbound: A call that a BlackBerry MVS user makes when the user's class of service is configured to have the PBX call the BlackBerry device for an outgoing call.
  • BlackBerry device-initiated inbound: A call to a BlackBerry MVS user when the user's class of service is configured to have the BlackBerry device call the PBX for an incoming call.
  • BlackBerry device-initiated outbound: A call that a BlackBerry MVS user makes when the user's class of service is configured to have the BlackBerry device call the PBX for an outgoing call.

The basic call direction terms are used when you describe the two basic Voice over Wi-Fi call flows:

  • Voice over Wi-Fi inbound: A call to a BlackBerry MVS user’s DID/DDI or extension that occurs when the user is registered to the BlackBerry MVS on a Wi-Fi connection.
  • Voice over Wi-Fi outbound: A call that a BlackBerry MVS user makes when that user is registered to the BlackBerry MVS on a Wi-Fi connection.
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Best practice: Configuring call direction

  • If you are using Voice over Mobile calling you must configure an inbound and outbound call direction for your users.
  • If your organization uses BlackBerry devices that operate on GSM networks, PBX-initiated calling offers optimal performance and reliability for BlackBerry Mobile Voice System calls.
  • If your organization uses devices that operate on CDMA networks, BlackBerry device-initiated calling offers optimal performance and reliability for BlackBerry MVS calls.
  • With device-initiated call direction, the BlackBerry MVS Client sends the DID/DDI Number as the called party number when it initiates call setup. The DID/DDI number tells the PBX that this is a BlackBerry MVS call. If you want to have the BlackBerry MVS Client make all calls regardless of performance considerations, this is considered to be your best option.
  • With PBX-initiated call direction, the PBX sends the Caller Identification Number as the calling party number when it initiates call setup. The Caller Identification Number tells the BlackBerry MVS Client that this is a BlackBerry MVS call. If the PBX does not send the Caller Identification Number as the calling party number when it initiates call setup, optional ANI numbers allow the BlackBerry MVS Client to identify the call as a BlackBerry MVS call. If you want the BlackBerry MVS Client to receive all calls regardless of performance considerations, this is considered to be your best option.
  • If you cannot pass DID/DDI numbers out of your PSTN connection, a workaround is to have all calls set up as BlackBerry device-initiated calls.

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