# Overview of h324Extract

The h324Extract utility extracts audio and video data from the recorded TDM bearer channel data. It creates raw audio and video files using data recorded and prepared by the linemon utility. If 3gpapp is accessible from the current directory, you can use h324Extract to convert the raw audio and video data to a 3GP file.

h324Extract can decode any 3G-324M call terminated by Video Access for call setup techniques including NSRP, WNSRP, MONA ACP, and MONA MPC.

If a MONA terminal encapsulates initial media frames in MONA signaling preferences messages, those frames are not extracted by h324Extract.

Currently, h324Extract does not support the creation of 3GP files when the audio codec is G.723, when the video codec is H.264, or both. However, the raw bit streams for audio and video can be extracted for these codec types.

For more information, refer to Overview of linemon and Overview of 3gpapp.