diff --git a/.gitignore b/.gitignore
index d1d4596..dc4a289 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,6 +51,7 @@ src/libserial/libserial.a
 src/libv27/libv27.a
 src/libmtp/libmtp.a
 src/libosmocc/libosmocc.a
+src/libg711/libg711.a
 src/anetz/libgermanton.a
 src/anetz/anetz
 src/bnetz/bnetz
diff --git a/configure.ac b/configure.ac
index 188a548..9f99f95 100644
--- a/configure.ac
+++ b/configure.ac
@@ -88,6 +88,7 @@ AC_OUTPUT(
     src/libv27/Makefile
     src/libmtp/Makefile
     src/libosmocc/Makefile
+    src/libg711/Makefile
     src/anetz/Makefile
     src/bnetz/Makefile
     src/cnetz/Makefile
diff --git a/src/Makefile.am b/src/Makefile.am
index b342db1..506328b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -29,7 +29,8 @@ SUBDIRS = \
 	libserial \
 	libv27 \
 	libmtp \
-	libosmocc
+	libosmocc \
+	libg711
 
 if HAVE_ALSA
 SUBDIRS += \
diff --git a/src/amps/Makefile.am b/src/amps/Makefile.am
index a1156d0..00c9ed6 100644
--- a/src/amps/Makefile.am
+++ b/src/amps/Makefile.am
@@ -44,6 +44,7 @@ amps_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/anetz/Makefile.am b/src/anetz/Makefile.am
index 58f5f0a..8e81867 100644
--- a/src/anetz/Makefile.am
+++ b/src/anetz/Makefile.am
@@ -33,6 +33,7 @@ anetz_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/bnetz/Makefile.am b/src/bnetz/Makefile.am
index 17e8044..7ea84ca 100644
--- a/src/bnetz/Makefile.am
+++ b/src/bnetz/Makefile.am
@@ -30,6 +30,7 @@ bnetz_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 bnetz_dialer_SOURCES = \
diff --git a/src/cnetz/Makefile.am b/src/cnetz/Makefile.am
index aeda33c..942aa65 100644
--- a/src/cnetz/Makefile.am
+++ b/src/cnetz/Makefile.am
@@ -38,6 +38,7 @@ cnetz_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/eurosignal/Makefile.am b/src/eurosignal/Makefile.am
index acfc92b..6be3f6a 100644
--- a/src/eurosignal/Makefile.am
+++ b/src/eurosignal/Makefile.am
@@ -29,6 +29,7 @@ eurosignal_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/fuvst/Makefile.am b/src/fuvst/Makefile.am
index 486e3b2..4152212 100644
--- a/src/fuvst/Makefile.am
+++ b/src/fuvst/Makefile.am
@@ -32,6 +32,7 @@ fuvst_LDADD = \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
 	$(top_builddir)/src/libsound/libsound.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	$(ALSA_LIBS) \
 	-lm
 
@@ -57,6 +58,7 @@ fuvst_sniffer_LDADD = \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
 	$(top_builddir)/src/libsound/libsound.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	$(ALSA_LIBS) \
 	-lm
 
diff --git a/src/imts/Makefile.am b/src/imts/Makefile.am
index 4b6d622..6a0c4d5 100644
--- a/src/imts/Makefile.am
+++ b/src/imts/Makefile.am
@@ -26,6 +26,7 @@ imts_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 imts_dialer_SOURCES = \
diff --git a/src/jolly/Makefile.am b/src/jolly/Makefile.am
index a225935..a135312 100644
--- a/src/jolly/Makefile.am
+++ b/src/jolly/Makefile.am
@@ -27,6 +27,7 @@ jollycom_LDADD = \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
 	$(top_builddir)/src/libfm/libfm.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/jtacs/Makefile.am b/src/jtacs/Makefile.am
index 23f0e76..760f830 100644
--- a/src/jtacs/Makefile.am
+++ b/src/jtacs/Makefile.am
@@ -27,6 +27,7 @@ jtacs_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/libg711/Makefile.am b/src/libg711/Makefile.am
new file mode 100644
index 0000000..15223bf
--- /dev/null
+++ b/src/libg711/Makefile.am
@@ -0,0 +1,7 @@
+AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+
+noinst_LIBRARIES = libg711.a
+
+libg711_a_SOURCES = \
+	g711.c
+
diff --git a/src/libg711/g711.c b/src/libg711/g711.c
new file mode 100644
index 0000000..cd195f9
--- /dev/null
+++ b/src/libg711/g711.c
@@ -0,0 +1,537 @@
+/*****************************************************************************\
+**                                                                           **
+** PBX4Linux                                                                 **
+**                                                                           **
+**---------------------------------------------------------------------------**
+** Copyright: Andreas Eversberg (GPL)                                        **
+**                                                                           **
+** audio conversions for alaw and ulaw                                       **
+**                                                                           **
+\*****************************************************************************/ 
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+/* ulaw -> signed 16-bit */
+static int16_t g711_ulaw_flipped_to_linear[256] =
+{
+	0x8284, 0x8684, 0x8a84, 0x8e84, 0x9284, 0x9684, 0x9a84, 0x9e84,
+	0xa284, 0xa684, 0xaa84, 0xae84, 0xb284, 0xb684, 0xba84, 0xbe84,
+	0xc184, 0xc384, 0xc584, 0xc784, 0xc984, 0xcb84, 0xcd84, 0xcf84,
+	0xd184, 0xd384, 0xd584, 0xd784, 0xd984, 0xdb84, 0xdd84, 0xdf84,
+	0xe104, 0xe204, 0xe304, 0xe404, 0xe504, 0xe604, 0xe704, 0xe804,
+	0xe904, 0xea04, 0xeb04, 0xec04, 0xed04, 0xee04, 0xef04, 0xf004,
+	0xf0c4, 0xf144, 0xf1c4, 0xf244, 0xf2c4, 0xf344, 0xf3c4, 0xf444,
+	0xf4c4, 0xf544, 0xf5c4, 0xf644, 0xf6c4, 0xf744, 0xf7c4, 0xf844,
+	0xf8a4, 0xf8e4, 0xf924, 0xf964, 0xf9a4, 0xf9e4, 0xfa24, 0xfa64,
+	0xfaa4, 0xfae4, 0xfb24, 0xfb64, 0xfba4, 0xfbe4, 0xfc24, 0xfc64,
+	0xfc94, 0xfcb4, 0xfcd4, 0xfcf4, 0xfd14, 0xfd34, 0xfd54, 0xfd74,
+	0xfd94, 0xfdb4, 0xfdd4, 0xfdf4, 0xfe14, 0xfe34, 0xfe54, 0xfe74,
+	0xfe8c, 0xfe9c, 0xfeac, 0xfebc, 0xfecc, 0xfedc, 0xfeec, 0xfefc,
+	0xff0c, 0xff1c, 0xff2c, 0xff3c, 0xff4c, 0xff5c, 0xff6c, 0xff7c,
+	0xff88, 0xff90, 0xff98, 0xffa0, 0xffa8, 0xffb0, 0xffb8, 0xffc0,
+	0xffc8, 0xffd0, 0xffd8, 0xffe0, 0xffe8, 0xfff0, 0xfff8, 0xffff,
+	0x7d7c, 0x797c, 0x757c, 0x717c, 0x6d7c, 0x697c, 0x657c, 0x617c,
+	0x5d7c, 0x597c, 0x557c, 0x517c, 0x4d7c, 0x497c, 0x457c, 0x417c,
+	0x3e7c, 0x3c7c, 0x3a7c, 0x387c, 0x367c, 0x347c, 0x327c, 0x307c,
+	0x2e7c, 0x2c7c, 0x2a7c, 0x287c, 0x267c, 0x247c, 0x227c, 0x207c,
+	0x1efc, 0x1dfc, 0x1cfc, 0x1bfc, 0x1afc, 0x19fc, 0x18fc, 0x17fc,
+	0x16fc, 0x15fc, 0x14fc, 0x13fc, 0x12fc, 0x11fc, 0x10fc, 0x0ffc,
+	0x0f3c, 0x0ebc, 0x0e3c, 0x0dbc, 0x0d3c, 0x0cbc, 0x0c3c, 0x0bbc,
+	0x0b3c, 0x0abc, 0x0a3c, 0x09bc, 0x093c, 0x08bc, 0x083c, 0x07bc,
+	0x075c, 0x071c, 0x06dc, 0x069c, 0x065c, 0x061c, 0x05dc, 0x059c,
+	0x055c, 0x051c, 0x04dc, 0x049c, 0x045c, 0x041c, 0x03dc, 0x039c,
+	0x036c, 0x034c, 0x032c, 0x030c, 0x02ec, 0x02cc, 0x02ac, 0x028c,
+	0x026c, 0x024c, 0x022c, 0x020c, 0x01ec, 0x01cc, 0x01ac, 0x018c,
+	0x0174, 0x0164, 0x0154, 0x0144, 0x0134, 0x0124, 0x0114, 0x0104,
+	0x00f4, 0x00e4, 0x00d4, 0x00c4, 0x00b4, 0x00a4, 0x0094, 0x0084,
+	0x0078, 0x0070, 0x0068, 0x0060, 0x0058, 0x0050, 0x0048, 0x0040,
+	0x0038, 0x0030, 0x0028, 0x0020, 0x0018, 0x0010, 0x0008, 0x0000
+};
+
+/* alaw -> signed 16-bit */
+static int16_t g711_alaw_flipped_to_linear[256] =
+{
+	0x13fc, 0xec04, 0x0144, 0xfebc, 0x517c, 0xae84, 0x051c, 0xfae4,
+	0x0a3c, 0xf5c4, 0x0048, 0xffb8, 0x287c, 0xd784, 0x028c, 0xfd74,
+	0x1bfc, 0xe404, 0x01cc, 0xfe34, 0x717c, 0x8e84, 0x071c, 0xf8e4,
+	0x0e3c, 0xf1c4, 0x00c4, 0xff3c, 0x387c, 0xc784, 0x039c, 0xfc64,
+	0x0ffc, 0xf004, 0x0104, 0xfefc, 0x417c, 0xbe84, 0x041c, 0xfbe4,
+	0x083c, 0xf7c4, 0x0008, 0xfff8, 0x207c, 0xdf84, 0x020c, 0xfdf4,
+	0x17fc, 0xe804, 0x018c, 0xfe74, 0x617c, 0x9e84, 0x061c, 0xf9e4,
+	0x0c3c, 0xf3c4, 0x0084, 0xff7c, 0x307c, 0xcf84, 0x030c, 0xfcf4,
+	0x15fc, 0xea04, 0x0164, 0xfe9c, 0x597c, 0xa684, 0x059c, 0xfa64,
+	0x0b3c, 0xf4c4, 0x0068, 0xff98, 0x2c7c, 0xd384, 0x02cc, 0xfd34,
+	0x1dfc, 0xe204, 0x01ec, 0xfe14, 0x797c, 0x8684, 0x07bc, 0xf844,
+	0x0f3c, 0xf0c4, 0x00e4, 0xff1c, 0x3c7c, 0xc384, 0x03dc, 0xfc24,
+	0x11fc, 0xee04, 0x0124, 0xfedc, 0x497c, 0xb684, 0x049c, 0xfb64,
+	0x093c, 0xf6c4, 0x0028, 0xffd8, 0x247c, 0xdb84, 0x024c, 0xfdb4,
+	0x19fc, 0xe604, 0x01ac, 0xfe54, 0x697c, 0x9684, 0x069c, 0xf964,
+	0x0d3c, 0xf2c4, 0x00a4, 0xff5c, 0x347c, 0xcb84, 0x034c, 0xfcb4,
+	0x12fc, 0xed04, 0x0134, 0xfecc, 0x4d7c, 0xb284, 0x04dc, 0xfb24,
+	0x09bc, 0xf644, 0x0038, 0xffc8, 0x267c, 0xd984, 0x026c, 0xfd94,
+	0x1afc, 0xe504, 0x01ac, 0xfe54, 0x6d7c, 0x9284, 0x06dc, 0xf924,
+	0x0dbc, 0xf244, 0x00b4, 0xff4c, 0x367c, 0xc984, 0x036c, 0xfc94,
+	0x0f3c, 0xf0c4, 0x00f4, 0xff0c, 0x3e7c, 0xc184, 0x03dc, 0xfc24,
+	0x07bc, 0xf844, 0x0008, 0xfff8, 0x1efc, 0xe104, 0x01ec, 0xfe14,
+	0x16fc, 0xe904, 0x0174, 0xfe8c, 0x5d7c, 0xa284, 0x05dc, 0xfa24,
+	0x0bbc, 0xf444, 0x0078, 0xff88, 0x2e7c, 0xd184, 0x02ec, 0xfd14,
+	0x14fc, 0xeb04, 0x0154, 0xfeac, 0x557c, 0xaa84, 0x055c, 0xfaa4,
+	0x0abc, 0xf544, 0x0058, 0xffa8, 0x2a7c, 0xd584, 0x02ac, 0xfd54,
+	0x1cfc, 0xe304, 0x01cc, 0xfe34, 0x757c, 0x8a84, 0x075c, 0xf8a4,
+	0x0ebc, 0xf144, 0x00d4, 0xff2c, 0x3a7c, 0xc584, 0x039c, 0xfc64,
+	0x10fc, 0xef04, 0x0114, 0xfeec, 0x457c, 0xba84, 0x045c, 0xfba4,
+	0x08bc, 0xf744, 0x0018, 0xffe8, 0x227c, 0xdd84, 0x022c, 0xfdd4,
+	0x18fc, 0xe704, 0x018c, 0xfe74, 0x657c, 0x9a84, 0x065c, 0xf9a4,
+	0x0cbc, 0xf344, 0x0094, 0xff6c, 0x327c, 0xcd84, 0x032c, 0xfcd4
+};
+
+/* Xlaw -> signed 16-bit */
+static int16_t g711_alaw_to_linear[256];
+static int16_t g711_ulaw_to_linear[256];
+
+/* signed 16-bit -> Xlaw */
+static uint8_t g711_linear_to_alaw_flipped[65536];
+static uint8_t g711_linear_to_ulaw_flipped[65536];
+static uint8_t g711_linear_to_alaw[65536];
+static uint8_t g711_linear_to_ulaw[65536];
+
+/* transcode */
+static uint8_t g711_alaw_to_ulaw[256];
+static uint8_t g711_ulaw_to_alaw[256];
+static uint8_t g711_alaw_flipped_to_ulaw[256];
+static uint8_t g711_ulaw_flipped_to_alaw[256];
+static uint8_t g711_alaw_to_ulaw_flipped[256];
+static uint8_t g711_ulaw_to_alaw_flipped[256];
+
+/* table is used to generate linear_to_alaw */
+static int16_t g711_alaw_relations[] =
+{
+	0x8684, 0x55, 0x8a84, 0xd5, 0x8e84, 0x15, 0x9284, 0x95,
+	0x9684, 0x75, 0x9a84, 0xf5, 0x9e84, 0x35, 0xa284, 0xb5,
+	0xa684, 0x45, 0xaa84, 0xc5, 0xae84, 0x05, 0xb284, 0x85,
+	0xb684, 0x65, 0xba84, 0xe5, 0xbe84, 0x25, 0xc184, 0xa5,
+	0xc384, 0x5d, 0xc584, 0xdd, 0xc784, 0x1d, 0xc984, 0x9d,
+	0xcb84, 0x7d, 0xcd84, 0xfd, 0xcf84, 0x3d, 0xd184, 0xbd,
+	0xd384, 0x4d, 0xd584, 0xcd, 0xd784, 0x0d, 0xd984, 0x8d,
+	0xdb84, 0x6d, 0xdd84, 0xed, 0xdf84, 0x2d, 0xe104, 0xad,
+	0xe204, 0x51, 0xe304, 0xd1, 0xe404, 0x11, 0xe504, 0x91,
+	0xe604, 0x71, 0xe704, 0xf1, 0xe804, 0x31, 0xe904, 0xb1,
+	0xea04, 0x41, 0xeb04, 0xc1, 0xec04, 0x01, 0xed04, 0x81,
+	0xee04, 0x61, 0xef04, 0xe1, 0xf004, 0x21, 0xf0c4, 0x59,
+	0xf0c4, 0xa1, 0xf144, 0xd9, 0xf1c4, 0x19, 0xf244, 0x99,
+	0xf2c4, 0x79, 0xf344, 0xf9, 0xf3c4, 0x39, 0xf444, 0xb9,
+	0xf4c4, 0x49, 0xf544, 0xc9, 0xf5c4, 0x09, 0xf644, 0x89,
+	0xf6c4, 0x69, 0xf744, 0xe9, 0xf7c4, 0x29, 0xf844, 0x57,
+	0xf844, 0xa9, 0xf8a4, 0xd7, 0xf8e4, 0x17, 0xf924, 0x97,
+	0xf964, 0x77, 0xf9a4, 0xf7, 0xf9e4, 0x37, 0xfa24, 0xb7,
+	0xfa64, 0x47, 0xfaa4, 0xc7, 0xfae4, 0x07, 0xfb24, 0x87,
+	0xfb64, 0x67, 0xfba4, 0xe7, 0xfbe4, 0x27, 0xfc24, 0x5f,
+	0xfc24, 0xa7, 0xfc64, 0x1f, 0xfc64, 0xdf, 0xfc94, 0x9f,
+	0xfcb4, 0x7f, 0xfcd4, 0xff, 0xfcf4, 0x3f, 0xfd14, 0xbf,
+	0xfd34, 0x4f, 0xfd54, 0xcf, 0xfd74, 0x0f, 0xfd94, 0x8f,
+	0xfdb4, 0x6f, 0xfdd4, 0xef, 0xfdf4, 0x2f, 0xfe14, 0x53,
+	0xfe14, 0xaf, 0xfe34, 0x13, 0xfe34, 0xd3, 0xfe54, 0x73,
+	0xfe54, 0x93, 0xfe74, 0x33, 0xfe74, 0xf3, 0xfe8c, 0xb3,
+	0xfe9c, 0x43, 0xfeac, 0xc3, 0xfebc, 0x03, 0xfecc, 0x83,
+	0xfedc, 0x63, 0xfeec, 0xe3, 0xfefc, 0x23, 0xff0c, 0xa3,
+	0xff1c, 0x5b, 0xff2c, 0xdb, 0xff3c, 0x1b, 0xff4c, 0x9b,
+	0xff5c, 0x7b, 0xff6c, 0xfb, 0xff7c, 0x3b, 0xff88, 0xbb,
+	0xff98, 0x4b, 0xffa8, 0xcb, 0xffb8, 0x0b, 0xffc8, 0x8b,
+	0xffd8, 0x6b, 0xffe8, 0xeb, 0xfff8, 0x2b, 0xfff8, 0xab,
+	0x0008, 0x2a, 0x0008, 0xaa, 0x0018, 0xea, 0x0028, 0x6a,
+	0x0038, 0x8a, 0x0048, 0x0a, 0x0058, 0xca, 0x0068, 0x4a,
+	0x0078, 0xba, 0x0084, 0x3a, 0x0094, 0xfa, 0x00a4, 0x7a,
+	0x00b4, 0x9a, 0x00c4, 0x1a, 0x00d4, 0xda, 0x00e4, 0x5a,
+	0x00f4, 0xa2, 0x0104, 0x22, 0x0114, 0xe2, 0x0124, 0x62,
+	0x0134, 0x82, 0x0144, 0x02, 0x0154, 0xc2, 0x0164, 0x42,
+	0x0174, 0xb2, 0x018c, 0x32, 0x018c, 0xf2, 0x01ac, 0x72,
+	0x01ac, 0x92, 0x01cc, 0x12, 0x01cc, 0xd2, 0x01ec, 0x52,
+	0x01ec, 0xae, 0x020c, 0x2e, 0x022c, 0xee, 0x024c, 0x6e,
+	0x026c, 0x8e, 0x028c, 0x0e, 0x02ac, 0xce, 0x02cc, 0x4e,
+	0x02ec, 0xbe, 0x030c, 0x3e, 0x032c, 0xfe, 0x034c, 0x7e,
+	0x036c, 0x9e, 0x039c, 0x1e, 0x039c, 0xde, 0x03dc, 0x5e,
+	0x03dc, 0xa6, 0x041c, 0x26, 0x045c, 0xe6, 0x049c, 0x66,
+	0x04dc, 0x86, 0x051c, 0x06, 0x055c, 0xc6, 0x059c, 0x46,
+	0x05dc, 0xb6, 0x061c, 0x36, 0x065c, 0xf6, 0x069c, 0x76,
+	0x06dc, 0x96, 0x071c, 0x16, 0x075c, 0xd6, 0x07bc, 0x56,
+	0x07bc, 0xa8, 0x083c, 0x28, 0x08bc, 0xe8, 0x093c, 0x68,
+	0x09bc, 0x88, 0x0a3c, 0x08, 0x0abc, 0xc8, 0x0b3c, 0x48,
+	0x0bbc, 0xb8, 0x0c3c, 0x38, 0x0cbc, 0xf8, 0x0d3c, 0x78,
+	0x0dbc, 0x98, 0x0e3c, 0x18, 0x0ebc, 0xd8, 0x0f3c, 0x58,
+	0x0f3c, 0xa0, 0x0ffc, 0x20, 0x10fc, 0xe0, 0x11fc, 0x60,
+	0x12fc, 0x80, 0x13fc, 0x00, 0x14fc, 0xc0, 0x15fc, 0x40,
+	0x16fc, 0xb0, 0x17fc, 0x30, 0x18fc, 0xf0, 0x19fc, 0x70,
+	0x1afc, 0x90, 0x1bfc, 0x10, 0x1cfc, 0xd0, 0x1dfc, 0x50,
+	0x1efc, 0xac, 0x207c, 0x2c, 0x227c, 0xec, 0x247c, 0x6c,
+	0x267c, 0x8c, 0x287c, 0x0c, 0x2a7c, 0xcc, 0x2c7c, 0x4c,
+	0x2e7c, 0xbc, 0x307c, 0x3c, 0x327c, 0xfc, 0x347c, 0x7c,
+	0x367c, 0x9c, 0x387c, 0x1c, 0x3a7c, 0xdc, 0x3c7c, 0x5c,
+	0x3e7c, 0xa4, 0x417c, 0x24, 0x457c, 0xe4, 0x497c, 0x64,
+	0x4d7c, 0x84, 0x517c, 0x04, 0x557c, 0xc4, 0x597c, 0x44,
+	0x5d7c, 0xb4, 0x617c, 0x34, 0x657c, 0xf4, 0x697c, 0x74,
+	0x6d7c, 0x94, 0x717c, 0x14, 0x757c, 0xd4, 0x797c, 0x54
+};
+
+uint8_t g711_flip[256];
+
+static int g711_initialized = 0;
+
+/* generate tables
+ */
+void g711_init(void)
+{
+	int i, j;
+
+	/* flip tables */
+	for (i = 0; i < 256; i++) {
+		g711_flip[i]
+			= ((i & 1) << 7)
+			+ ((i & 2) << 5)
+			+ ((i & 4) << 3)
+			+ ((i & 8) << 1)
+			+ ((i & 16) >> 1)
+			+ ((i & 32) >> 3)
+			+ ((i & 64) >> 5)
+			+ ((i & 128) >> 7);
+		g711_alaw_to_linear[i] = g711_alaw_flipped_to_linear[g711_flip[i]];
+		g711_ulaw_to_linear[i] = g711_ulaw_flipped_to_linear[g711_flip[i]];
+	}
+
+	/* linear to alaw tables */
+	i = j = 0;
+	while(i < 65536) {
+		if (i - 32768 > g711_alaw_relations[j << 1])
+			j++;
+		if (j > 255)
+			j = 255;
+		g711_linear_to_alaw_flipped[(i - 32768) & 0xffff] = g711_alaw_relations[(j << 1) | 1];
+		g711_linear_to_alaw[(i - 32768) & 0xffff] = g711_flip[g711_alaw_relations[(j << 1) | 1]];
+		i++;
+	}
+
+	/* linear to ulaw tables */
+	i = j = 0;
+	while(i < 32768) {
+		if (i - 32768 > g711_ulaw_flipped_to_linear[j])
+			j++;
+		g711_linear_to_ulaw_flipped[(i - 32768) & 0xffff] = j;
+		g711_linear_to_ulaw[(i - 32768) & 0xffff] = g711_flip[j];
+		i++;
+	}
+	j = 255;
+	while(i < 65536) {
+		if (i - 32768 > g711_alaw_flipped_to_linear[j])
+			j--;
+		g711_linear_to_ulaw_flipped[(i - 32768) & 0xffff] = j;
+		g711_linear_to_ulaw[(i - 32768) & 0xffff] = g711_flip[j];
+		i++;
+	}
+
+	/* transcode */
+	for (i = 0; i < 256; i++) {
+		g711_alaw_to_ulaw[i] = g711_linear_to_ulaw[(uint16_t)g711_alaw_to_linear[i]];
+		g711_ulaw_to_alaw[i] = g711_linear_to_alaw[(uint16_t)g711_ulaw_to_linear[i]];
+		g711_alaw_flipped_to_ulaw[i] = g711_linear_to_ulaw[(uint16_t)g711_alaw_to_linear[g711_flip[i]]];
+		g711_ulaw_flipped_to_alaw[i] = g711_linear_to_alaw[(uint16_t)g711_ulaw_to_linear[g711_flip[i]]];
+		g711_alaw_to_ulaw_flipped[i] = g711_flip[g711_linear_to_ulaw[(uint16_t)g711_alaw_to_linear[i]]];
+		g711_ulaw_to_alaw_flipped[i] = g711_flip[g711_linear_to_alaw[(uint16_t)g711_ulaw_to_linear[i]]];
+	}
+
+	g711_initialized = 1;
+}
+
+void g711_encode_alaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	int16_t *src = (int16_t *)src_data;
+	uint8_t *dst;
+	int len = src_len / 2, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+	dst = malloc(len);
+	if (!dst)
+		return;
+	for (i = 0; i < len; i++)
+		dst[i] = g711_linear_to_alaw_flipped[(uint16_t)src[i]];
+	*dst_data = dst;
+	*dst_len = len;
+}
+
+void g711_encode_ulaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	int16_t *src = (int16_t *)src_data;
+	uint8_t *dst;
+	int len = src_len / 2, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+	dst = malloc(len);
+	if (!dst)
+		return;
+	for (i = 0; i < len; i++)
+		dst[i] = g711_linear_to_ulaw_flipped[(uint16_t)src[i]];
+	*dst_data = dst;
+	*dst_len = len;
+}
+
+void g711_decode_alaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+        uint8_t *src = src_data;
+	int16_t *dst;
+        int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len * 2);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_alaw_flipped_to_linear[src[i]];
+        *dst_data = (uint8_t *)dst;
+        *dst_len = len * 2;
+}
+
+void g711_decode_ulaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+        uint8_t *src = src_data;
+	int16_t *dst;
+        int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len * 2);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_ulaw_flipped_to_linear[src[i]];
+        *dst_data = (uint8_t *)dst;
+        *dst_len = len * 2;
+}
+
+void g711_encode_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	int16_t *src = (int16_t *)src_data;
+	uint8_t *dst;
+	int len = src_len / 2, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+	dst = malloc(len);
+	if (!dst)
+		return;
+	for (i = 0; i < len; i++)
+		dst[i] = g711_linear_to_alaw[(uint16_t)src[i]];
+	*dst_data = dst;
+	*dst_len = len;
+}
+
+void g711_encode_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	int16_t *src = (int16_t *)src_data;
+	uint8_t *dst;
+	int len = src_len / 2, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+	dst = malloc(len);
+	if (!dst)
+		return;
+	for (i = 0; i < len; i++)
+		dst[i] = g711_linear_to_ulaw[(uint16_t)src[i]];
+	*dst_data = dst;
+	*dst_len = len;
+}
+
+void g711_decode_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+        uint8_t *src = src_data;
+	int16_t *dst;
+        int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len * 2);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_alaw_to_linear[src[i]];
+        *dst_data = (uint8_t *)dst;
+        *dst_len = len * 2;
+}
+
+void g711_decode_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+        uint8_t *src = src_data;
+	int16_t *dst;
+        int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len * 2);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_ulaw_to_linear[src[i]];
+        *dst_data = (uint8_t *)dst;
+        *dst_len = len * 2;
+}
+
+void g711_transcode_alaw_to_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_alaw_to_ulaw[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
+void g711_transcode_alaw_flipped_to_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_alaw_flipped_to_ulaw[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
+void g711_transcode_alaw_to_ulaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_alaw_to_ulaw_flipped[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
+void g711_transcode_ulaw_to_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_ulaw_to_alaw[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
+void g711_transcode_ulaw_flipped_to_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_ulaw_flipped_to_alaw[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
+void g711_transcode_ulaw_to_alaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_ulaw_to_alaw_flipped[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
+void g711_transcode_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len)
+{
+	uint8_t *src = src_data, *dst;
+	int len = src_len, i;
+
+	if (!g711_initialized) {
+		fprintf(stderr, "G711 codec not initialized! Please fix!\n");
+		abort();
+	}
+
+        dst = malloc(len);
+        if (!dst)
+                return;
+        for (i = 0; i < len; i++)
+                dst[i] = g711_flip[src[i]];
+        *dst_data = dst;
+        *dst_len = len;
+}
+
diff --git a/src/libg711/g711.h b/src/libg711/g711.h
new file mode 100644
index 0000000..795f60b
--- /dev/null
+++ b/src/libg711/g711.h
@@ -0,0 +1,17 @@
+void g711_init(void);
+void g711_encode_alaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_encode_ulaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_decode_alaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_decode_ulaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_encode_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_encode_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_decode_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_decode_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_alaw_to_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_alaw_flipped_to_ulaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_alaw_to_ulaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_ulaw_to_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_ulaw_flipped_to_alaw(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_ulaw_to_alaw_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+void g711_transcode_flipped(uint8_t *src_data, int src_len, uint8_t **dst_data, int *dst_len);
+
diff --git a/src/nmt/Makefile.am b/src/nmt/Makefile.am
index 4bfd766..a7e13f6 100644
--- a/src/nmt/Makefile.am
+++ b/src/nmt/Makefile.am
@@ -40,6 +40,7 @@ nmt_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/r2000/Makefile.am b/src/r2000/Makefile.am
index 0fd8fdd..56b07e0 100644
--- a/src/r2000/Makefile.am
+++ b/src/r2000/Makefile.am
@@ -28,6 +28,7 @@ radiocom2000_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/tacs/Makefile.am b/src/tacs/Makefile.am
index 478730e..70f9e78 100644
--- a/src/tacs/Makefile.am
+++ b/src/tacs/Makefile.am
@@ -28,6 +28,7 @@ tacs_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/test/Makefile.am b/src/test/Makefile.am
index 409a638..d48e22e 100644
--- a/src/test/Makefile.am
+++ b/src/test/Makefile.am
@@ -69,6 +69,7 @@ test_dms_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
@@ -104,6 +105,7 @@ test_sms_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	-lm
 
 if HAVE_ALSA
diff --git a/src/zeitansage/Makefile.am b/src/zeitansage/Makefile.am
index 0d84c9a..d2a74b9 100644
--- a/src/zeitansage/Makefile.am
+++ b/src/zeitansage/Makefile.am
@@ -24,6 +24,7 @@ zeitansage_LDADD = \
 	$(top_builddir)/src/libwave/libwave.a \
 	$(top_builddir)/src/libmncc/libmncc.a \
 	$(top_builddir)/src/libsample/libsample.a \
+	$(top_builddir)/src/libg711/libg711.a \
 	$(ALSA_LIBS) \
 	-lm