diff --git a/jni/Application.mk b/jni/Application.mk
index 71a4a2021..36fe8b7fc 100644
--- a/jni/Application.mk
+++ b/jni/Application.mk
@@ -95,7 +95,7 @@ APP_MODULES += libwebrtc_system_wrappers libwebrtc_spl libwebrtc_apm_utility lib
 APP_MODULES += libwebrtc_spl_neon libwebrtc_aecm_neon
 endif
 
-ifneq ($(BUILD_WEBRTC_ISAC), 0)
+ifeq ($(BUILD_WEBRTC_ISAC), 1)
 APP_MODULES += libwebrtc_spl libwebrtc_isacfix libmsisac
 APP_MODULES += libwebrtc_spl_neon libwebrtc_isacfix_neon
 endif
diff --git a/submodules/externals/build/msisac/Android.mk b/submodules/externals/build/msisac/Android.mk
new file mode 100755
index 000000000..5e978ec38
--- /dev/null
+++ b/submodules/externals/build/msisac/Android.mk
@@ -0,0 +1,8 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libmsisac-linphone
+LOCAL_MODULE_FILENAME := libmsisac-linphone-$(TARGET_ARCH)
+LOCAL_SRC_FILES := $(TARGET_ARCH)/libmsisac-linphone-$(TARGET_ARCH).so
+
+include $(PREBUILT_SHARED_LIBRARY)
diff --git a/submodules/externals/build/webrtc/common_audio/signal_processing/Android.mk b/submodules/externals/build/webrtc/common_audio/signal_processing/Android.mk
index 0c04ebea3..62a4583e3 100644
--- a/submodules/externals/build/webrtc/common_audio/signal_processing/Android.mk
+++ b/submodules/externals/build/webrtc/common_audio/signal_processing/Android.mk
@@ -18,14 +18,36 @@ LOCAL_MODULE_CLASS := STATIC_LIBRARIES
 LOCAL_MODULE := libwebrtc_spl
 LOCAL_MODULE_TAGS := optional
 LOCAL_SRC_FILES := \
+    auto_corr_to_refl_coef.c \
+    auto_correlation.c \
     complex_fft.c \
+    copy_set_operations.c \
     cross_correlation.c \
     division_operations.c \
+    dot_product_with_scale.c \
     downsample_fast.c \
+    energy.c \
+    filter_ar.c \
+    filter_ma_fast_q12.c \
+    get_hanning_window.c \
+    get_scaling_square.c \
+    ilbc_specific_functions.c \
+    levinson_durbin.c \
+    lpc_to_refl_coef.c \
     min_max_operations.c \
     randomization_functions.c \
     real_fft.c \
+    refl_coef_to_lpc.c \
+    resample.c \
+    resample_48khz.c \
+    resample_by_2.c \
+    resample_by_2_internal.c \
+    resample_fractional.c \
     spl_init.c \
+    spl_sqrt.c \
+    spl_version.c \
+    splitting_filter.c \
+    sqrt_of_one_minus_x_squared.c \
     vector_scaling_operations.c
 
 # Flags passed to both C and C++ files.
@@ -36,6 +58,13 @@ LOCAL_C_INCLUDES := \
     $(LOCAL_PATH)/include \
     $(LOCAL_PATH)/../.. 
 
+ifeq ($(ARCH_ARM_HAVE_ARMV7A),true)
+LOCAL_SRC_FILES += \
+    filter_ar_fast_q12_armv7.s
+else
+LOCAL_SRC_FILES += \
+    filter_ar_fast_q12.c
+endif
 ifeq ($(TARGET_ARCH),arm)
 LOCAL_SRC_FILES += \
     complex_bit_reverse_arm.s \