ISDN tapping/tracing/recording software. Allows to record D-channels as GSMTAP and can store raw B-channel data for calls as files. Supports only DAHDI for now.
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README.md

osmo-isdntap - Osmocom ISDN tap daemon

This repository contains a small stand-alone [daemon] program that you can run to create recordings of ISDN calls.

It is part of the Osmocom retronetworking project.

The program works by passively decoding the ISDN D-channel, specifically the Q.931 call control protocol. Whenever a call is being set up, it starts to capture the B-channel timeslot allocated to that call. It creates two files, one for each of the two directions of the call. The files contain the raw transparent binary B-channel data.

Currently the only supported ISDN hardware/driver interface is DAHDI.

Currently, only PRI (primary rate) ISDN interfaces are supported.

Homepage

https://osmocom.org/projects/osmo-isdntap/wiki

GIT Repository

You can clone from the official osmo-isdntap.git repository using

git clone https://gitea.osmocom.org/retronetworking/osmo-isdntap

There is a web interface at https://gitea.osmocom.org/retronetworking/osmo-isdntap

Converting recordings to audio

If you'd like to convert any of the recorded files to audio, you can use the following example command to do so:

sox --channels 1 --type raw --rate 8000 -e a-law isdntap-03012342111-03012343038-20221016-212558-8-tx.raw output.wav

The generated output.wav file can then be played back with any standard audio player.