diff --git a/.gitmodules b/.gitmodules
index 0b37b3c3e..88ea29f34 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -46,3 +46,6 @@
 [submodule "submodules/externals/srtp"]
 	path = submodules/externals/srtp
 	url = git://git.linphone.org/srtp.git
+[submodule "submodules/mssilk"]
+	path = submodules/mssilk
+	url = git://git.linphone.org/mssilk.git
diff --git a/README b/README
index 159a833c5..9ac244430 100644
--- a/README
+++ b/README
@@ -18,6 +18,7 @@ Option Name     |     Possible values
 BUILD_X264            0 (don't build x264) or 1 (build x264)
 BUILD_AMR             0 (don't build amr codec), light (try to use amr codec from android), full (build your own amr codec)
 BUILD_GPLV3_ZRTP      0 (don't support ZRTP), 1 (support ZRTP and make the whole program GPLv3)
+BUILD_SILK            0 (don't build silk plugin), 1 (build silk) [silk is Skype nonfree patented audio codec]
 
 
 
diff --git a/jni/Android.mk b/jni/Android.mk
index 8f2ed924d..b2218a002 100755
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -61,11 +61,17 @@ include $(linphone-root-dir)/submodules/linphone/mediastreamer2/build/android/An
 include $(linphone-root-dir)/submodules/linphone/mediastreamer2/tests/Android.mk
 
 
+ifeq ($(BUILD_SILK), 1)
+$(info Build proprietary SILK plugin for mediastreamer2)
+include $(linphone-root-dir)/submodules/mssilk/Android.mk
+endif
+
 
 ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
 include $(linphone-root-dir)/submodules/msilbc/Android.mk
 
 ifeq ($(BUILD_X264), 1)
+$(info Build X264 plugin for mediastreamer2)
 include $(linphone-root-dir)/submodules/msx264/Android.mk
 ifeq ($(wildcard $(linphone-root-dir)/submodules/externals/prebuilts/x264.mk),)
 include $(linphone-root-dir)/submodules/externals/build/x264/Android.mk
@@ -74,7 +80,6 @@ include $(linphone-root-dir)/submodules/externals/prebuilts/x264.mk
 endif
 endif
 
-
 ifeq ($(wildcard $(linphone-root-dir)/submodules/externals/prebuilts/ffmpeg.mk),)
 include $(linphone-root-dir)/submodules/externals/build/ffmpeg/Android.mk
 else
@@ -86,6 +91,7 @@ endif #armeabi-v7a
 
 
 ifeq ($(BUILD_GPLV3_ZRTP), 1)
+$(info Build ZRTP support - makes application GPLv3)
 ifeq ($(wildcard $(linphone-root-dir)/submodules/externals/prebuilts/zrtpcpp.mk),)
 include $(linphone-root-dir)/submodules/externals/build/libzrtpcpp/Android.mk
 else
diff --git a/jni/Application.mk b/jni/Application.mk
index 9eb68e381..88e0e64f0 100644
--- a/jni/Application.mk
+++ b/jni/Application.mk
@@ -22,6 +22,10 @@ ifeq ($(BUILD_X264),1)
 APP_MODULES +=libx264 libmsx264
 endif
 
+ifeq ($(BUILD_SILK),1)
+APP_MODULES +=libmssilk
+endif
+
 ifeq ($(RING),yes)
 APP_MODULES      += libring
 endif
@@ -40,5 +44,6 @@ linphone-root-dir:=$(APP_PROJECT_PATH)
 
 APP_BUILD_SCRIPT:=$(call my-dir)/Android.mk
 APP_PLATFORM := android-8
+#APP_ABI := armeabi-v7a
 APP_ABI := armeabi-v7a armeabi
 APP_CFLAGS:=-DDISABLE_NEON
diff --git a/prepare_sources.sh b/prepare_sources.sh
index 93ecd83c8..bb3aab619 100755
--- a/prepare_sources.sh
+++ b/prepare_sources.sh
@@ -8,11 +8,13 @@ if test -z "`git status | grep neon`" ; then
 	cd $topdir
 	patch -p0 < ${topdir}/patches/ffmpeg_scalar_product_remove_alignment_hints.patch
 fi
-cd $topdir
 
-cd submodules/libilbc-rfc3951 && ./autogen.sh && ./configure && make || ( echo "iLBC prepare stage failed" ; exit 1 )
+cd $topdir/submodules/libilbc-rfc3951 && ./autogen.sh && ./configure && make || ( echo "iLBC prepare stage failed" ; exit 1 )
 
 cd $topdir/submodules/externals/build/libvpx && ./asm_conversion.sh && cp *.asm *.h ../../libvpx/ || ( echo "VP8 prepare stage failed." ; exit 1 )
 
+cd $topdir/submodules/mssilk && ./autogen.sh && ./configure && cd downloads && make || ( echo "SILK audio plugin prepare state failed." ; exit 1 )
+
+
 # As a memo, the config.h for zrtpcpp is generated using the command
 # cmake  -Denable-ccrtp=false submodules/externals/libzrtpcpp
diff --git a/res/values/non_localizable_strings.xml b/res/values/non_localizable_strings.xml
index 082eb68c6..cd385b680 100644
--- a/res/values/non_localizable_strings.xml
+++ b/res/values/non_localizable_strings.xml
@@ -42,6 +42,10 @@
     <string name="pref_codec_speex8_key">pref_codec_speex8_key</string>
     <string name="pref_codec_speex16_key">pref_codec_speex16_key</string>
     <string name="pref_codec_speex32_key">pref_codec_speex32_key</string>
+    <string name="pref_codec_silk8_key">pref_codec_silk8_key</string>
+    <string name="pref_codec_silk12_key">pref_codec_silk12_key</string>
+    <string name="pref_codec_silk16_key">pref_codec_silk16_key</string>
+    <string name="pref_codec_silk24_key">pref_codec_silk24_key</string>
     <string name="pref_codecs_key">pref_codecs_key</string>
     <string name="pref_stun_server_key">pref_stun_server_key</string>
     <string name="pref_video_codec_vp8_key">pref_video_codec_vp8_key</string>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 3cf5e0c86..e8c7d15f4 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -130,6 +130,10 @@
     <string name="pref_codec_ilbc">ilbc</string>
     <string name="pref_codec_speex8">speex 8 Khz</string>
     <string name="pref_codec_speex16">speex 16 Khz</string>
+    <string name="pref_codec_silk8">silk 8 Khz</string>
+    <string name="pref_codec_silk12">silk 12 Khz</string>
+    <string name="pref_codec_silk16">silk 16 Khz</string>
+    <string name="pref_codec_silk24">silk 24 Khz</string>
     <string name="pref_codecs">Codecs</string>
     <string name="place_call_chooser">Place a call</string>
 <string name="pref_debug">Debug</string>
diff --git a/res/xml/preferences.xml b/res/xml/preferences.xml
index b6f689f0c..7e19d07b9 100644
--- a/res/xml/preferences.xml
+++ b/res/xml/preferences.xml
@@ -66,6 +66,14 @@
 			<CheckBoxPreference android:key="@string/pref_codec_g722_key"
 				android:defaultValue="false"
 				android:title="@string/pref_codec_g722"/>
+			<CheckBoxPreference android:key="@string/pref_codec_silk24_key"
+				android:title="@string/pref_codec_silk24"/>
+			<CheckBoxPreference android:key="@string/pref_codec_silk16_key"
+				android:title="@string/pref_codec_silk16"/>
+			<CheckBoxPreference android:key="@string/pref_codec_silk12_key"
+				android:title="@string/pref_codec_silk12"/>
+			<CheckBoxPreference android:key="@string/pref_codec_silk8_key"
+				android:title="@string/pref_codec_silk8"/>
 			<CheckBoxPreference android:key="@string/pref_codec_pcmu_key"
 				android:title="@string/pref_codec_pcmu"/>
 			<CheckBoxPreference android:key="@string/pref_codec_pcma_key"
diff --git a/src/org/linphone/LinphoneManager.java b/src/org/linphone/LinphoneManager.java
index 528f4fa85..cfaa8063e 100644
--- a/src/org/linphone/LinphoneManager.java
+++ b/src/org/linphone/LinphoneManager.java
@@ -504,6 +504,11 @@ public final class LinphoneManager implements LinphoneCoreListener {
 			enableDisableAudioCodec("PCMU", 8000, R.string.pref_codec_pcmu_key);
 			enableDisableAudioCodec("PCMA", 8000, R.string.pref_codec_pcma_key);
 			enableDisableAudioCodec("AMR", 8000, R.string.pref_codec_amr_key);
+			enableDisableAudioCodec("SILK", 24000, R.string.pref_codec_silk24_key);
+			enableDisableAudioCodec("SILK", 16000, R.string.pref_codec_silk16_key);
+			enableDisableAudioCodec("SILK", 12000, R.string.pref_codec_silk12_key);
+			enableDisableAudioCodec("SILK", 8000, R.string.pref_codec_silk8_key);
+
 			
 			// Configure video codecs
 			for (PayloadType videoCodec : mLc.getVideoCodecs()) {
diff --git a/src/org/linphone/LinphonePreferencesActivity.java b/src/org/linphone/LinphonePreferencesActivity.java
index 1745b3404..9086b0a30 100644
--- a/src/org/linphone/LinphonePreferencesActivity.java
+++ b/src/org/linphone/LinphonePreferencesActivity.java
@@ -62,10 +62,15 @@ public class LinphonePreferencesActivity extends PreferenceActivity implements E
 		return (CheckBoxPreference) findPreference(getString(key));
 	}
 
-	private void detectAudioCodec(int id, String mime, int rate) {
+	private void detectAudioCodec(int id, String mime, int rate, boolean hide) {
 		boolean enable = LinphoneService.isReady() && LinphoneManager.getLc().findPayloadType(mime, rate)!=null;
-		findPreference(id).setEnabled(enable);
+		Preference cb = findPreference(id);
+		cb.setEnabled(enable);
+		if (hide && !enable) {
+			cb.setLayoutResource(R.layout.hidden);
+		}
 	}
+
 	private void detectVideoCodec(int id, String mime) {
 		findPreference(id).setEnabled(LinphoneManager.getInstance().detectVideoCodec(mime));
 	}
@@ -89,12 +94,16 @@ public class LinphonePreferencesActivity extends PreferenceActivity implements E
 
 		boolean fastCpu = Version.isArmv7();
 		if (fastCpu) {
-			detectAudioCodec(pref_codec_ilbc_key, "iLBC", 8000);
+			detectAudioCodec(pref_codec_ilbc_key, "iLBC", 8000, false);
 			findPreference(pref_codec_speex16_key).setEnabled(true);
 			//findPreference(pref_codec_speex32_key)).setEnabled(enableIlbc);
 		}
 		
-		detectAudioCodec(pref_codec_amr_key,"AMR",8000);
+		detectAudioCodec(pref_codec_amr_key,"AMR",8000, false);
+		detectAudioCodec(R.string.pref_codec_silk8_key,"SILK",8000, true);
+		detectAudioCodec(R.string.pref_codec_silk12_key,"SILK",12000, true);
+		detectAudioCodec(R.string.pref_codec_silk16_key,"SILK",16000, true);
+		detectAudioCodec(R.string.pref_codec_silk24_key,"SILK",24000, true);
 
 		// No video
 		if (!Version.isVideoCapable()) {
diff --git a/submodules/linphone b/submodules/linphone
index 0fb206da3..65dc7621f 160000
--- a/submodules/linphone
+++ b/submodules/linphone
@@ -1 +1 @@
-Subproject commit 0fb206da3a4602e23d48579674a8210dccef2c4b
+Subproject commit 65dc7621f45449893de50c28b94653c9af0ecb22
diff --git a/submodules/mssilk b/submodules/mssilk
new file mode 160000
index 000000000..4735f6fe0
--- /dev/null
+++ b/submodules/mssilk
@@ -0,0 +1 @@
+Subproject commit 4735f6fe0a5a8e466c06cab6cb5cbaa37e94dab7