Megaco
Another implementation of the Media Gateway Control Protocol architecture is the H.248/Megaco protocol, a collaboration of the Internet Engineering Task Force (RFC 3525) and the International Telecommunication Union (Recommendation H.248.1). Both protocols follow the guidelines of the overlying Media Gateway Control Protocol architecture, as described in RFC 2805. However, the protocols are incompatible due to differences in protocol syntax and underlying connection model.
Read more about this topic: Media Gateway Control Protocol (MGCP)