diff --git a/DiscordEuroscope/ConfigData.cpp b/DiscordEuroscope/ConfigData.cpp
index b4e2f53..c95ce3e 100644
--- a/DiscordEuroscope/ConfigData.cpp
+++ b/DiscordEuroscope/ConfigData.cpp
@@ -31,6 +31,7 @@ namespace DiscordEuroScope_Configuration
 		this->discord_presence_large_image_key = "";
 		this->discord_presence_small_image_key = "";
 		this->sweatbox_bypass = false;
+		this->loaded_from_ese = false;
 		this->RadioCallsigns.clear();
 		for (int i = 0; i < 7; i++)
 		{
diff --git a/DiscordEuroscope/ConfigData.h b/DiscordEuroscope/ConfigData.h
index eacde9a..67ac2c9 100644
--- a/DiscordEuroscope/ConfigData.h
+++ b/DiscordEuroscope/ConfigData.h
@@ -26,7 +26,14 @@
 
 namespace DiscordEuroScope_Configuration
 {
-	typedef std::map<std::string, std::string> typeRadioCallsigns;
+	typedef struct
+	{
+		std::string callsign;
+		std::string icao;
+		std::string frequency;
+		std::string radio_callsign;
+	} RadioCallsignElement_t;
+	typedef std::vector<RadioCallsignElement_t> RadioCallsigns_t;
 	enum States_Enum
 	{
 		State_Idle,
@@ -56,7 +63,8 @@ namespace DiscordEuroScope_Configuration
 		std::string discord_presence_small_image_key;
 		bool sweatbox_bypass;
 		State states[7];
-		typeRadioCallsigns RadioCallsigns;
+		RadioCallsigns_t RadioCallsigns;
+		bool loaded_from_ese = false;
 
 		ConfigData();
 
diff --git a/DiscordEuroscope/ConfigManager.cpp b/DiscordEuroscope/ConfigManager.cpp
index 84cf86b..1b4e7cf 100644
--- a/DiscordEuroscope/ConfigManager.cpp
+++ b/DiscordEuroscope/ConfigManager.cpp
@@ -27,6 +27,11 @@
 
 const char default_file_content[] = DEFAULT_FILE_CONTENT;
 
+// caching so we don't regex every time
+static std::string last_fetch_callsign = "";
+static std::string last_returned_rcallsign = "";
+static std::string last_fetch_frequency = "";
+
 namespace DiscordEuroScope_Configuration
 {
 	ConfigManager::ConfigManager()
@@ -129,56 +134,93 @@ namespace DiscordEuroScope_Configuration
 		_ready = false;
 		json_document.GetAllocator().Clear();
 		data.Cleanup();
+		last_fetch_callsign = "";
+		last_returned_rcallsign = "";
+		last_fetch_frequency = "";
 	}
 
 	void ConfigManager::LoadRadioCallsigns()
 	{
-		if (json_document.HasMember("load_from_ese")) {
-			if (json_document["load_from_ese"].IsBool() && json_document["load_from_ese"].GetBool() && json_document["path_to_ese"].IsString())
+		if (!json_document["radio_callsigns"].IsObject()) return;
+		auto& RadioCallsignObj = json_document["radio_callsigns"];
+		auto& RadioCallsignConfigObj = RadioCallsignObj["config"];
+		if (RadioCallsignConfigObj.HasMember("load_from_ese")) {
+			if (RadioCallsignConfigObj["load_from_ese"].IsBool() && RadioCallsignConfigObj["load_from_ese"].GetBool())
 			{
-				std::string relative_to_full_path;
-				std::string relative_path = json_document["path_to_ese"].GetString();
+				std::string relative_to_absolute_path;
+				std::string relative_path = 
+					RadioCallsignConfigObj.HasMember("path_to_ese") && RadioCallsignConfigObj["path_to_ese"].IsString()
+					? RadioCallsignConfigObj["path_to_ese"].GetString()
+					: ".\\";
 				if (relative_path[1] == ':')
-					relative_to_full_path = relative_path;
+					relative_to_absolute_path = relative_path;
 				else
-					relative_to_full_path = this->file_path.substr(0, this->file_path.find_last_of('\\') + 1) + relative_path;
-				if (ESEHandler::LocateESEFile(relative_to_full_path))
+					relative_to_absolute_path = this->file_path.substr(0, this->file_path.find_last_of('\\') + 1) + relative_path;
+				if (ESEHandler::LocateESEFile(relative_to_absolute_path))
 				{
-					int p = ESEHandler::ParsePositions();
-					ESEHandler::GetRadioCallsigns(data.RadioCallsigns);
-					return;
+					if (ESEHandler::ParsePositions() > 0) {
+						data.loaded_from_ese = true;
+						ESEHandler::GetRadioCallsigns(data.RadioCallsigns);
+						return;
+					}
 				}
 			}
 		}
 
-		assert(json_document["radio_callsigns"].IsObject());
+		assert(RadioCallsignObj.HasMember("custom") && RadioCallsignObj["custom"].IsArray());
 		data.RadioCallsigns.clear();
-		for (auto& it : json_document["radio_callsigns"].GetObject())
+		for (auto& it : RadioCallsignObj["custom"].GetArray())
 		{
-			if (it.name.GetType() == rapidjson::kStringType && it.value.GetType() == rapidjson::kStringType)
+			if (it.IsObject())
 			{
-				data.RadioCallsigns.insert(std::pair<std::string, std::string>(it.name.GetString(), it.value.GetString()));
+				RadioCallsignElement_t element;
+				if (it.HasMember("callsign") && it["callsign"].IsString())
+					element.callsign = std::string(it["callsign"].GetString());
+				if (it.HasMember("frequency") && it["frequency"].IsString())
+					element.frequency = std::string(it["frequency"].GetString());
+				if (it.HasMember("rcallsign") && it["rcallsign"].IsString())
+					element.radio_callsign = std::string(it["rcallsign"].GetString());
+
+				element.icao = element.callsign.substr(0, element.callsign.find_first_of('_'));
+				data.RadioCallsigns.push_back(element);
 			}
 		}
 	}
 
-	void ConfigManager::FindRadioCallsign(std::string callsign, std::string& radio_callsign)
+	void ConfigManager::FindRadioCallsign(std::string callsign, std::string frequency, std::string& radio_callsign)
 	{
 		// caching so we don't regex every time
-		static std::string last_fetch_callsign = "";
-		static std::string last_returned_rcallsign = "";
-		if (callsign == last_fetch_callsign)
+		if (callsign == last_fetch_callsign && frequency == last_fetch_frequency)
 		{
 			radio_callsign = last_returned_rcallsign; // return cached result
 			return;
 		}
 		last_fetch_callsign = callsign;
+		last_fetch_frequency = frequency;
+		std::string icao = callsign.substr(0, callsign.find_first_of('_'));
+
+		if (data.loaded_from_ese)
+		{
+			for (auto& it : data.RadioCallsigns)
+			{
+				if (it.icao == icao && it.frequency == frequency)
+				{
+					radio_callsign = it.radio_callsign;
+					last_returned_rcallsign = radio_callsign;
+					return;
+				}
+			}
+			last_returned_rcallsign = radio_callsign = callsign;
+			return;
+		}
+
 		for (auto& it : data.RadioCallsigns)
 		{
-			std::regex rgx(std::string(it.first));
+			std::regex rgx(std::string(it.callsign));
 			std::smatch rgx_match;
 			if(!std::regex_search(callsign, rgx_match, rgx)) continue;
-			radio_callsign = it.second;
+			if (!it.frequency.empty() && !(it.frequency == frequency && it.icao == icao)) continue;
+			radio_callsign = it.radio_callsign;
 
 			std::vector<std::string> dict;
 			for (int rgx_it = 1; rgx_it < rgx_match.size(); rgx_it++)
diff --git a/DiscordEuroscope/ConfigManager.h b/DiscordEuroscope/ConfigManager.h
index e8681bc..39277dc 100644
--- a/DiscordEuroscope/ConfigManager.h
+++ b/DiscordEuroscope/ConfigManager.h
@@ -57,7 +57,7 @@ namespace DiscordEuroScope_Configuration
 		void Cleanup(void);
 		void LoadRadioCallsigns(void);
 		void GenerateConfigFile(std::string filepath);
-		void FindRadioCallsign(std::string callsign, std::string& radio_callsign);
+		void FindRadioCallsign(std::string callsign, std::string frequency, std::string& radio_callsign);
 	};
 }
 
diff --git a/DiscordEuroscope/DefaultFileContent.h b/DiscordEuroscope/DefaultFileContent.h
index 7555911..afa1444 100644
--- a/DiscordEuroscope/DefaultFileContent.h
+++ b/DiscordEuroscope/DefaultFileContent.h
@@ -69,8 +69,20 @@
         }\r\
     },\r\
     \"radio_callsigns\": {\r\
-        \"^HECC_CTR$\": \"Cairo Control Bandbox\",\r\
-        \"^HECC_(\\\\d+)(?:_)CTR$\" : \"Cairo Control ACC $0\"\r\
+        \"config\": {\r\
+            \"load_from_ese\": false,\r\
+            \"path_to_ese\" : \"..\\\\..\\\\\"\r\
+        },\r\
+        \"custom\" : [\r\
+            {\r\
+                \"callsign\": \"^HECC_CTR$\",\r\
+                \"rcallsign\" : \"Cairo Control Bandbox\"\r\
+            },\r\
+            {\r\
+                \"callsign\": \"^HECC_(\\\\d+)(?:_)CTR$\",\r\
+                \"rcallsign\" : \"Cairo Control ACC $0\"\r\
+            }\r\
+        ]\r\
     }\r\
 }\r\
 ")
\ No newline at end of file
diff --git a/DiscordEuroscope/DiscordEuroscopeExt.cpp b/DiscordEuroscope/DiscordEuroscopeExt.cpp
index 6f76c37..7a465e9 100644
--- a/DiscordEuroscope/DiscordEuroscopeExt.cpp
+++ b/DiscordEuroscope/DiscordEuroscopeExt.cpp
@@ -176,8 +176,9 @@ VOID CALLBACK DiscordTimer(_In_ HWND hwnd, _In_ UINT uMsg, _In_ UINT_PTR idEvent
 
 	std::string freq_str(8, 0);
 	std::snprintf((char*)freq_str.c_str(), 8, "%.3f", frequency);
+	freq_str = std::string(freq_str, 0, strlen(freq_str.c_str()));
 	std::string radio_callsign;
-	pMyPlugIn->config.FindRadioCallsign(callsign, radio_callsign);
+	pMyPlugIn->config.FindRadioCallsign(callsign, freq_str, radio_callsign);
 	const std::map<std::string, std::string> Dictionary =
 	{
 		{"callsign", callsign},
diff --git a/DiscordEuroscope/ESEHandler.cpp b/DiscordEuroscope/ESEHandler.cpp
index 751ae1d..3f0a636 100644
--- a/DiscordEuroscope/ESEHandler.cpp
+++ b/DiscordEuroscope/ESEHandler.cpp
@@ -1,5 +1,6 @@
 #include "stdafx.h"
 #include "ESEHandler.h"
+#include "ConfigData.h"
 #include <filesystem>
 #include <fstream>
 
@@ -58,11 +59,27 @@ int ESEHandler::ParsePositions(void)
 	return positions.size();
 }
 
-void ESEHandler::GetRadioCallsigns(std::map<std::string, std::string>& rcs)
+void ESEHandler::GetRadioCallsigns(RadioCallsigns_t& rcs)
 {
+	using namespace DiscordEuroScope_Configuration;
 	rcs.clear();
 	for (auto& pos : positions)
 	{
-		rcs.insert(std::pair<std::string, std::string>(pos.callsign, pos.radio_callsign));
+		DiscordEuroScope_Configuration::RadioCallsignElement_t element;
+		element.callsign = pos.callsign;
+		element.frequency = pos.frequency;
+		element.icao = pos.callsign.substr(0, pos.callsign.find_first_of('_'));
+		element.radio_callsign = pos.radio_callsign;
+		bool flag = false;
+		for (auto& it : rcs)
+		{
+			if (it.callsign == element.callsign /* TEMP DISABLE || (it.icao == element.icao && it.frequency == element.frequency)*/)
+			{
+				flag = true;
+				break;
+			}
+		}
+		if(!flag)
+			rcs.push_back(element);
 	}
 }
diff --git a/DiscordEuroscope/ESEHandler.h b/DiscordEuroscope/ESEHandler.h
index 7dfbdbd..86a4e13 100644
--- a/DiscordEuroscope/ESEHandler.h
+++ b/DiscordEuroscope/ESEHandler.h
@@ -19,7 +19,9 @@
 #include <string>
 #include <vector>
 #include <map>
+#include "ConfigData.h"
 
+using DiscordEuroScope_Configuration::RadioCallsigns_t;
 
 struct ESEPositionItem
 {
@@ -36,5 +38,5 @@ class ESEHandler
 public:
 	static bool LocateESEFile(std::string relative_path_to_ese);
 	static int ParsePositions(void);
-	static void GetRadioCallsigns(std::map<std::string, std::string>& rcs);
+	static void GetRadioCallsigns(RadioCallsigns_t& rcs);
 };