Before revision: MMTel is a global telephony standard based on IP Multimedia Subsystem (IMS) , offering converged, fixed and mobile real-time multimedia communication using the media capabilities such as voice, real-time video, text, file transfer and sharing of pictures, audio and video clips.
After revision: The 3GPP/NGN IP Multimedia Subsystem (IMS) multimedia telephony service (MMTel) is a global telephony standard based on the IMS , offering converged, fixed and mobile real-time multimedia communication using the media capabilities such as voice, real-time video, text, file transfer and sharing of pictures, audio and video clips.