If you connect the BlackBerry Mobile Voice System directly to the PBX using SIP, you must configure an external hardware-based MTP. The recording solution monitors (or spans) the switch ports that are connected to the BlackBerry MVS Server and the external MTP resource. This spanning mechanism copies all messages and media that is destined for or originates from the BlackBerry MVS Server and the external MTP resource to the recording solution. The recording solution then captures, tags and archives the messages and media appropriately.