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- A caller who is external to an organization dials the work number of a BlackBerry Mobile Voice System user.
- The PBX creates a call establishment request and sends it to the MVS Session Manager over the SIP line.
- The MVS Session Manager filters the request through the recipient’s unknown caller ID setting, call scheduling setting, allowed caller list, and blocked caller list. If the call is permitted, the MVS Session Manager sends the call establishment request to the BlackBerry Enterprise Server.
- The BlackBerry Enterprise Server compresses and encrypts the incoming call request and sends it to the wireless data network. The call establishment request includes the caller ID information and phone number of the caller, and the DID/DDI number that the BlackBerry MVS Client uses to communicate with the MVS Session Manager.
- The BlackBerry device decrypts and decompresses the incoming call request, compresses and encrypts a call establishment response, and sends the call establishment response to the BlackBerry Enterprise Server.
- The BlackBerry Enterprise Server decrypts and decompresses the call establishment response, 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 BlackBerry MVS Client uses the wireless voice network to make a call to the PBX.
- 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 and sends a message to the BlackBerry MVS Client to indicate that it answered the call.
- The MVS Session Manager and the BlackBerry MVS Client use a two-way protocol to authenticate the call.
- The MVS Session Manager verifies that the call is a BlackBerry MVS call.
- The device rings and the BlackBerry MVS user accepts the call.
- The BlackBerry MVS Client sends a connection request using the SIP trunk through the PBX to the MVS Session Manager using DTMF tones.
- The MVS Session Manager connects the SIP line call leg to the SIP trunk call leg, and voice communication occurs.