Before revision: The 3GPP/NGN IP Multimedia Subsystem (IMS) multimedia telephony service (MMTel ) is a global 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.
After revision: MMTel is a global standard based on IP Multimedia Subsystem (IMS)telephony , 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.