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RTP, AMR and ALSA playback support in Osmcoom gapk

The Osmocom GSM Audio Pocket Knife can now be used to decode and play back a live RTP stream
Added by laforge 3 months ago

In the last few days, the Osmocom gapk (GSM Audio Pocket Knife) has been extended with the following feature set:
  • support of audio play-back via ALSA (standard Linux sound card drivers)
  • support for Adaptive Multi-Rate (AMR)
  • support for RTP payload formats for AMR, EFR HR-ETSI and HR-IETF

If all those new features are combined, you can use gapk as a RTP playback sink for any of the codecs used in (not only) Osmocom GSM networks. This is very useful for debugging, particularly if combined with a recent patch to OsmoBSC/OsmoNITB enabling the administrator to re-direct any BTS-originated RTP stream of an active call by issuing an IPA RSL MDCX command.


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