GSM Audio Pocket Knife
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gapk - GSM Audio Pocket Knife

The GSM Audio Picket 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.

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