MPPP multilink point-to-point protocol This is a standard communications protocol used over ISDN to bond separate data-carrying B channels together to transfer data effectively through a larger "pipe." Just as they can under PPP, dissimilar devices can communicate over multilink PPP connections to access the Internet. MPPP also allows both channels to be used for either voice or data transmissions and supports dynamic bandwidth allocation. This means that one of the two channels can be automatically dropped and reallocated for a phone call when calls come in. Once a call has been completed, the channel can be reconnected to continue data transfer over MPPP.