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
- 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.