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gapk - GSM Audio Pocket Knife

The GSM Audio Pocket Knife is a tool that can help you to convert codec frames of all codecs in GSM networks between a variety of different formats / representations.

It is part of the Osmocom Open Source Mobile Communications project.

GIT Repository

You can clone from the official gapk.git repository using

git clone

There is a web interface at


Unfortunately none.

Mailing List

Discussions related to gapk are happening on the mailing list, please see for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.