This paper proposes a multi-media packet protocol for realizing packetized data, voice, and video communications in a packet switched network. Requirements for such multi-media packet communications services are greatly manifold, ranging from low to high speed, low to high grade service quality or simple to sophisticated service facilities, depending on the communications media.The proposed protocol provides high-speed transmission function with priority rules, transmission error correcting functions and packet transit delay indicating functions for voice and video communications, in addition to the X. 25 protocol functions for data commmunications. Also, a newlylayered structure for this protocol is presented, in which functional overlaps among layers are eliminated and common functions used by every medium are arranged into lower layers.