diff --git a/app/src/main/assets/config b/app/src/main/assets/config
index 027e97e3..95e84d98 100644
--- a/app/src/main/assets/config
+++ b/app/src/main/assets/config
@@ -21,6 +21,7 @@ rtp_stats no
 dyn_dns yes
 net_prefer_ipv6 no
 module opus.so
+module amr.so
 module ilbc.so
 module g7221.so
 module g722.so
diff --git a/app/src/main/cpp/CMakeLists.txt b/app/src/main/cpp/CMakeLists.txt
index 058106b4..849419a9 100644
--- a/app/src/main/cpp/CMakeLists.txt
+++ b/app/src/main/cpp/CMakeLists.txt
@@ -5,19 +5,19 @@ set(distribution_DIR ${CMAKE_SOURCE_DIR}/../../../../distribution)
 
 add_library(lib_crypto STATIC IMPORTED)
 set_target_properties(lib_crypto PROPERTIES IMPORTED_LOCATION
-    ${distribution_DIR}/openssl/lib/${ANDROID_ABI}/libcrypto.a)
+        ${distribution_DIR}/openssl/lib/${ANDROID_ABI}/libcrypto.a)
 
 add_library(lib_ssl STATIC IMPORTED)
 set_target_properties(lib_ssl PROPERTIES IMPORTED_LOCATION
-    ${distribution_DIR}/openssl/lib/${ANDROID_ABI}/libssl.a)
+        ${distribution_DIR}/openssl/lib/${ANDROID_ABI}/libssl.a)
 
 add_library(lib_re STATIC IMPORTED)
 set_target_properties(lib_re PROPERTIES IMPORTED_LOCATION
-    ${distribution_DIR}/re/lib/${ANDROID_ABI}/libre.a)
+        ${distribution_DIR}/re/lib/${ANDROID_ABI}/libre.a)
 
 add_library(lib_rem STATIC IMPORTED)
 set_target_properties(lib_rem PROPERTIES IMPORTED_LOCATION
-    ${distribution_DIR}/rem/lib/${ANDROID_ABI}/librem.a)
+        ${distribution_DIR}/rem/lib/${ANDROID_ABI}/librem.a)
 
 add_library(lib_opus STATIC IMPORTED)
 set_target_properties(lib_opus PROPERTIES IMPORTED_LOCATION
@@ -25,15 +25,19 @@ set_target_properties(lib_opus PROPERTIES IMPORTED_LOCATION
 
 add_library(lib_spandsp STATIC IMPORTED)
 set_target_properties(lib_spandsp PROPERTIES IMPORTED_LOCATION
-		${distribution_DIR}/spandsp/lib/${ANDROID_ABI}/libspandsp.a)
+        ${distribution_DIR}/spandsp/lib/${ANDROID_ABI}/libspandsp.a)
 
 add_library(lib_g722_1 STATIC IMPORTED)
 set_target_properties(lib_g722_1 PROPERTIES IMPORTED_LOCATION
-		${distribution_DIR}/g7221/lib/${ANDROID_ABI}/libg722_1.a)
+        ${distribution_DIR}/g7221/lib/${ANDROID_ABI}/libg722_1.a)
+
+add_library(lib_amrnb STATIC IMPORTED)
+set_target_properties(lib_amrnb PROPERTIES IMPORTED_LOCATION
+        ${distribution_DIR}/amr/lib/${ANDROID_ABI}/libamrnb.a)
 
 add_library(lib_ilbc STATIC IMPORTED)
 set_target_properties(lib_ilbc PROPERTIES IMPORTED_LOCATION
-		${distribution_DIR}/ilbc/lib/${ANDROID_ABI}/libilbc.a)
+        ${distribution_DIR}/ilbc/lib/${ANDROID_ABI}/libilbc.a)
 
 add_library(lib_webrtc STATIC IMPORTED)
 set_target_properties(lib_webrtc PROPERTIES IMPORTED_LOCATION
@@ -49,30 +53,31 @@ set_target_properties(lib_zrtp PROPERTIES IMPORTED_LOCATION
 
 add_library(lib_baresip STATIC IMPORTED)
 set_target_properties(lib_baresip PROPERTIES IMPORTED_LOCATION
-    ${distribution_DIR}/baresip/lib/${ANDROID_ABI}/libbaresip.a)
+        ${distribution_DIR}/baresip/lib/${ANDROID_ABI}/libbaresip.a)
 
 add_library(baresip SHARED baresip.c)
 
 target_include_directories(baresip PRIVATE
-                           ${distribution_DIR}/openssl/include
-                           ${distribution_DIR}/re/include
-                           ${distribution_DIR}/rem/include
-                           ${distribution_DIR}/baresip/include)
+        ${distribution_DIR}/openssl/include
+        ${distribution_DIR}/re/include
+        ${distribution_DIR}/rem/include
+        ${distribution_DIR}/baresip/include)
 
 target_link_libraries(baresip
-		android
-		OpenSLES
-		lib_baresip
-		lib_rem
-		lib_re
-		lib_ssl
-		lib_crypto
-		lib_opus
-		lib_spandsp
-		lib_g722_1
-		lib_ilbc
-		lib_webrtc
-		lib_zrtp
-		lib_bn
-		z
-		log)
+        android
+        OpenSLES
+        lib_baresip
+        lib_rem
+        lib_re
+        lib_ssl
+        lib_crypto
+        lib_opus
+        lib_spandsp
+        lib_g722_1
+        lib_ilbc
+        lib_amrnb
+        lib_webrtc
+        lib_zrtp
+        lib_bn
+        z
+        log)
diff --git a/app/src/main/kotlin/com/tutpro/baresip/Config.kt b/app/src/main/kotlin/com/tutpro/baresip/Config.kt
index f97f3f77..531e1477 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Config.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Config.kt
@@ -21,9 +21,10 @@ object Config {
             config = "${config}ausrc_format s16\nauplay_format s16\nauenc_format s16\naudec_format s16\nmodule webrtc_aec.so\n"
             write = true
         }
-        if (!config.contains(Regex("module[ ]+g726.so"))) {
+        if (!config.contains(Regex("module[ ]+amr.so"))) {
             config = config.replace(Regex("module[ ]+g7...?.so\n"), "")
             config = config.replace(Regex("module[ ]+ilbc.so\n"), "")
+            config = "${config}module amr.so\n"
             config = "${config}module ilbc.so\n"
             config = "${config}module g7221.so\n"
             config = "${config}module g722.so\n"
@@ -94,6 +95,7 @@ object Config {
                 write = true
             }
         }
+
         if (write) {
             Log.e("Baresip", "Writing config '$config'")
             Utils.putFileContents(configPath, config.toByteArray())