- Verify that the users that you want to add to the BlackBerry Mobile Voice System have BlackBerry Enterprise Server user accounts.
- Verify that the BlackBerry devices are activated for existing users.
- In the PBX, verify that the users' Directory Number and Device Name matches the numeric value that you type in the Extension Number field. The Extension Number field cannot contain non-numeric characters such as the plus (+) or hash (#) symbols or other characters such as comma (,), slash (\ /), or apostrophe ('). The BlackBerry MVS uses the Extension Number field to register the BlackBerry MVS Client to the BlackBerry MVS Server, and in the case of a PBX deployment, register to the PBX as a valid SIP device.
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