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- A caller within an organization uses a BlackBerry device to dial the extension number of another BlackBerry Mobile Voice System user.
- The BlackBerry MVS Client creates a call establishment request, which includes the destination number. The BlackBerry MVS Client compresses and encrypts the call establishment request, and sends it to the BlackBerry Enterprise Server over the wireless data network.
- The BlackBerry Enterprise Server decrypts and decompresses the call establishment 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 sends a confirmation request to the device. The confirmation request includes the DID/DDI number that the BlackBerry MVS Client uses to communicate with the MVS Session Manager.
- The BlackBerry MVS Client uses the wireless voice network to make a call to the PBX using the DID/DDI number.
- The PBX routes the call to the MVS Session Manager over the SIP trunk using the DID/DDI number.
- The MVS Session Manager answers the call to the DID/DDI number.
- The MVS Session Manager and the BlackBerry MVS Client use a two-way protocol to authenticate the call.
- The MVS Session Manager verifies the call and requests that the PBX make a call to the extension number using the SIP line.
- The PBX determines that the extension number is internal to the organization and rings the extension number over the organization's LAN.
- The recipient answers the call at a desk phone.
- The MVS Session Manager uses DTMF tones to indicate to the device that the call is connected to the extension number. The MVS Session Manager connects the SIP line call leg to the SIP trunk call leg, and voice communication occurs.