- A BlackBerry Mobile Voice System user connects to an organization's Wi-Fi network and authenticates with the BlackBerry MVS. The BlackBerry MVS user makes a call from a BlackBerry device to a number that is external to the organization.
- The device creates a call establishment request, which includes the destination number. The device then compresses and encrypts the call establishment request, and sends it to the BlackBerry Enterprise Server over the Wi-Fi network.
- The BlackBerry Enterprise Server decrypts and decompresses the call establishment request, and sends it to the MVS BlackBerry Enterprise Server Connector over a TCP connection.
- The MVS BlackBerry Enterprise Server Connector sends the request to the MVS Session Manager.
- The MVS Session Manager sends the request using SIP to the PBX over a UDP port.
- The PBX determines that the phone number is external to the organization and rings the phone number over the PSTN.
- The recipient answers the call at the external phone and voice communication occurs over an RTP connection that the PBX opens between two endpoints.
Previous topic: Making a BlackBerry device–initiated call from a BlackBerry device to an external number