3G2 is an audio / video format that was developed using the 3rd Generation Partnership Project 2 (3GPP2). The file extension is an improved version of the 3GP format. Today it is already outdated, despite the fact that it was previously updated. As a result of the implementation of the 3rd Generation Partnership Project, standards were developed that relate to methods of transmitting a wide variety of media data. For example, on mobile networks. The development of such standards, in particular, has led to the introduction of the 3G2 format and to the use of various types of media data on the global network for online streaming. This type of file is most often used on mobile phones, as well as on phones that support 3G. 3G2 video files can also be played on many computers. We emphasize that in this case there may be a need for additional applications. The 3G2 format is very similar to the MPEG-4 Part 14 series (MP4) format. However, in comparison with it, the 3G2 format is not so complicated. When you apply this type of file, you need to consider the possibility of reducing the requirements for the width of both the information transfer channel and disk space. So, the format for mobile phones is exactly what you need. 3G2 files have been specifically developed for phones operating in the CDMA standard.
QCP is an audio file category format. It has the full name Qualcomm PureVoice Audio File, since the format was developed by Qualcomm. The main application is the preservation of various types of recorded sound. The development of this format was in the company specifically for recording, storage and playback of all frequencies of the human voice. Files with the .QCP extension are most often used specifically for recording human voices, as well as for processing pauses that are natural for human speech. QCP files are also widely used for recording ringtones for mobile phones. They are very often applied as a sound attachment to emails. The standard plugin for many email programs is the PureVoice Player-Recorder program, which allows you to listen to the email application as a file with the .QCP extension. Also on any device, you can install the PureVoice SDK plugin, which allows you to listen to sound files with the extension .QCP. QCP belongs to the category of container formats. He can not independently set the encoding parameters of sound files. Inside the file with the extension .QCP there are files that use the EVRC or QCELP method for encoding.