diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ae85a4ed..9b50e6f5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,7 +1,6 @@
 cmake_minimum_required(VERSION 3.10)
 project(rtphone)
 
- 
 # Rely on C++ 17
 set (CMAKE_CXX_STANDARD 20)
 set (CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/src/engine/engine_config.h b/src/engine/engine_config.h
index 772a633d..e0d14490 100644
--- a/src/engine/engine_config.h
+++ b/src/engine/engine_config.h
@@ -17,7 +17,7 @@
 #define AUDIO_CHANNELS 1
 
 // Samplerate must be 8 / 16 / 24 / 32 / 48 KHz
-#define AUDIO_SAMPLERATE 8000
+#define AUDIO_SAMPLERATE 48000
 #define AUDIO_MIC_BUFFER_COUNT 16
 #define AUDIO_MIC_BUFFER_LENGTH 10
 #define AUDIO_MIC_BUFFER_SIZE  (AUDIO_MIC_BUFFER_LENGTH * AUDIO_SAMPLERATE / 1000 * 2 * AUDIO_CHANNELS)
@@ -50,9 +50,9 @@
 #define MT_MAXRTPPACKET 1500
 #define MT_DTMF_END_PACKETS 3
 
-#define RTP_BUFFER_HIGH 24480
+#define RTP_BUFFER_HIGH 480
 #define RTP_BUFFER_LOW 10
-#define RTP_BUFFER_PREBUFFER 80
+#define RTP_BUFFER_PREBUFFER 320
 #define RTP_DECODED_CAPACITY 2048
 
 #define DEFAULT_SUBSCRIPTION_TIME 1200