The Integrated Voice Processor card provides integrated voicemail capabilities to the Plexus systems. Available models support from 4 to 24 channels. The base configuration of the IVP offers over 40 hours of recording time, over 500 mailboxes, and the ability to utilize up to 10 simultaneous auto-attendant trees. The serial port on the IVP card is used to archive stored voice mail messages on the IVP card hard drive.