Known issues
The BlackBerry® Mobile Voice System does not currently support automatic failover of Cisco® Unified Communications Manager clustering. BlackBerry device users that are roaming internationally might not be able to make or receive calls if the international carrier does not pass the caller ID of the telephony connector from the BlackBerry device user's home wireless service provider.
BlackBerry MVS Server bundle 17 and BlackBerry MVS Client bundle 24 do not support BlackBerry devices that operate on iDEN® networks.