The BlackBerry Mobile Voice System 5.1 SP1 does not support BlackBerry devices that operate on iDEN networks.

Users must have BlackBerry Device Software 5.0 or later and must be associated with a Cisco Unified Communications Manager 7.1 or later PBX before they can add participants to an active call.

You might have to change the Disable Wi-Fi Direct Access to BlackBerry Enterprise Server IT policy rule so that your organization's devices can connect to the BlackBerry Enterprise Server using a Wi-Fi connection. If the policy is not set, your organization's users might not be able to make calls using a Wi-Fi network. The default value of this policy is a null value. The default value might vary depending on which mobile network provider a device is using. For more information about the policy reference, see the BlackBerry Enterprise Server Policy Reference Guide.

BlackBerry MVS does not support G.729.

You cannot put a plus sign (+) in front of the extension number when you are configuring users in the MVS Console.

The BlackBerry MVS Server administrator can activate the MVSConfigToolNR.exe to enable a custom network restriction for BlackBerry MVS. Please be advised that if this custom network restriction is enabled, the ability of end users to make Wi-Fi calls will be restricted. If the custom network restriction is enabled, Wi-Fi calls will only be processed and accessible where cellular coverage (at a minimum, SOS) is available through an airtime service provider.

The No Data Calling feature is not supported when you are routing calls through a SIP Gateway.