diff --git a/src/ice/ice_agent.cpp b/src/ice/ice_agent.cpp
index fb57b65..51a3d3e 100644
--- a/src/ice/ice_agent.cpp
+++ b/src/ice/ice_agent.cpp
@@ -59,6 +59,11 @@ int IceAgent::CreateIceAgent(nice_cb_state_changed_t on_state_changed,
                               : (enable_turn_ ? NICE_AGENT_OPTION_NONE
                                               : NICE_AGENT_OPTION_RELIABLE)));
 
+    LOG_INFO(
+        "Nice agent init with [trickle ice|{}], [reliable mode|{}], [turn "
+        "support|{}]]",
+        trickle_ice_, !enable_turn_, enable_turn_);
+
     if (agent_ == nullptr) {
       LOG_ERROR("Failed to create agent_");
     }
diff --git a/src/transmission/ice_transmission.cpp b/src/transmission/ice_transmission.cpp
index 282c4d1..9b40a55 100644
--- a/src/transmission/ice_transmission.cpp
+++ b/src/transmission/ice_transmission.cpp
@@ -325,6 +325,8 @@ int IceTransmission::InitIceTransmission(
               ice_transmission_obj->rtp_data_receiver_->InsertRtpPacket(packet);
             } else if (ice_transmission_obj->CheckIsRtcpPacket(buffer, size)) {
               // LOG_ERROR("Rtcp packet [{}]", (uint8_t)(buffer[1]));
+            } else {
+              LOG_ERROR("Unknown packet");
             }
           }
         }
@@ -469,6 +471,11 @@ uint8_t IceTransmission::CheckIsRtcpPacket(const char *buffer, size_t size) {
     return 0;
   }
 
+  uint8_t v = (buffer[0] >> 6) & 0x03;
+  if (2 != v) {
+    return 0;
+  }
+
   uint8_t pt = buffer[1];
 
   switch (pt) {
@@ -498,6 +505,11 @@ uint8_t IceTransmission::CheckIsVideoPacket(const char *buffer, size_t size) {
     return 0;
   }
 
+  uint8_t v = (buffer[0] >> 6) & 0x03;
+  if (2 != v) {
+    return 0;
+  }
+
   uint8_t pt = buffer[1] & 0x7F;
   if (RtpPacket::PAYLOAD_TYPE::H264 == pt ||
       RtpPacket::PAYLOAD_TYPE::H264_FEC_SOURCE == pt ||
@@ -514,6 +526,11 @@ uint8_t IceTransmission::CheckIsAudioPacket(const char *buffer, size_t size) {
     return 0;
   }
 
+  uint8_t v = (buffer[0] >> 6) & 0x03;
+  if (2 != v) {
+    return 0;
+  }
+
   uint8_t pt = buffer[1] & 0x7F;
   if (RtpPacket::PAYLOAD_TYPE::OPUS == pt) {
     return pt;
@@ -527,6 +544,11 @@ uint8_t IceTransmission::CheckIsDataPacket(const char *buffer, size_t size) {
     return 0;
   }
 
+  uint8_t v = (buffer[0] >> 6) & 0x03;
+  if (2 != v) {
+    return 0;
+  }
+
   uint8_t pt = buffer[1] & 0x7F;
   if (RtpPacket::PAYLOAD_TYPE::DATA == pt) {
     return pt;