--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/README	Fri May 24 20:31:50 2024 +0000
@@ -0,0 +1,3 @@
+This repository contains tools and notes related to reverse engineering of
+various components on the network side of GSM, as well as behavioral reverse
+engineering of actual commercial GSM networks.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trau-decode/README	Fri May 24 20:31:50 2024 +0000
@@ -0,0 +1,4 @@
+The two little programs in this directory analyze PCM timeslot recordings
+that contain Abis/Ater TRAU frames, such as those in ../trau-files directory.
+These programs make use of Themyscira GSM codec libraries libgsmfr2 and
+libgsmefr.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/trau-files/README	Fri May 24 20:31:50 2024 +0000
@@ -0,0 +1,7 @@
+The two starting source files in this directory (e1_ts2_efr.bin and
+e1_ts2_fr.bin) originate from Osmocom:
+
+https://cgit.osmocom.org/libosmo-abis/tree/contrib/trau2rtp
+
+The Makefile contained here automates the process of extracting interesting
+bits from these E1 Abis UL recordings.