diff --git a/README.md b/README.md
index 127f28cb5..392e5b6d6 100644
--- a/README.md
+++ b/README.md
@@ -1580,7 +1580,7 @@ I believe that this can be easily and effectively applied to sending a large num
 
 ## Experimentals
 ### OpenTelemetry
-MagicOnion.OpenTelemetry is implementation of [open\-telemetry/opentelemetry\-dotnet: OpenTelemetry \.NET SDK](https://github.com/open-telemetry/opentelemetry-dotnet), so you can use any OpenTelemetry exporter, like [Prometheus](https://prometheus.io/), [StackDriver](https://cloud.google.com/stackdriver/pricing), [Zipkin](https://zipkin.io/) and others.
+MagicOnion.OpenTelemetry is implementation of [open\-telemetry/opentelemetry\-dotnet: OpenTelemetry \.NET SDK](https://github.com/open-telemetry/opentelemetry-dotnet), so you can use any OpenTelemetry exporter, like [Jaeger](https://www.jaegertracing.io/), [Zipkin](https://zipkin.io/), [StackDriver](https://cloud.google.com/stackdriver) and others.
 
 See details at [MagicOnion.Server.OpenTelemetry](src/MagicOnion.Server.OpenTelemetry)
 
diff --git a/samples/ChatApp.Telemetry/ChatApp.Server/ChatHub.cs b/samples/ChatApp.Telemetry/ChatApp.Server/ChatHub.cs
index 9cd52e5c5..586ff35df 100644
--- a/samples/ChatApp.Telemetry/ChatApp.Server/ChatHub.cs
+++ b/samples/ChatApp.Telemetry/ChatApp.Server/ChatHub.cs
@@ -19,25 +19,27 @@ public class ChatHub : StreamingHubBase<IChatHub, IChatHubReceiver>, IChatHub
         private string myName;
         private readonly ActivitySource mysqlActivity;
         private readonly ActivitySource redisActivity;
+        private readonly MagicOnionOpenTelemetryOptions options;
 
-        public ChatHub(BackendActivitySources backendActivity)
+        public ChatHub(BackendActivitySources backendActivity, MagicOnionOpenTelemetryOptions options)
         {
-            this.mysqlActivity = backendActivity.Get("mysql");
-            this.redisActivity = backendActivity.Get("redis");
+            this.options = options;
+            mysqlActivity = backendActivity.Get("mysql");
+            redisActivity = backendActivity.Get("redis");
         }
 
         public async Task JoinAsync(JoinRequest request)
         {
-            var random = new Random();
-            this.room = await this.Group.AddAsync(request.RoomName);
-            this.myName = request.UserName;
-
-            this.Broadcast(this.room).OnJoin(request.UserName);
+            room = await this.Group.AddAsync(request.RoomName);
+            myName = request.UserName;
+            Broadcast(this.room).OnJoin(request.UserName);
 
             // dummy external operation db.
+            var random = new Random();
             using (var activity = mysqlActivity.StartActivity("room/insert", ActivityKind.Internal))
             {
                 // this is sample. use orm or any safe way.
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("table", "rooms");
                 activity.SetTag("query", $"INSERT INTO rooms VALUES (0, '@room', '@username', '1');");
                 activity.SetTag("parameter.room", request.RoomName);
@@ -46,6 +48,7 @@ public async Task JoinAsync(JoinRequest request)
             }
             using (var activity = redisActivity.StartActivity($"member/status", ActivityKind.Internal))
             {
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("command", "set");
                 activity.SetTag("parameter.key", this.myName);
                 activity.SetTag("parameter.value", "1");
@@ -59,15 +62,15 @@ public async Task JoinAsync(JoinRequest request)
 
         public async Task LeaveAsync()
         {
-            var random = new Random();
             await this.room.RemoveAsync(this.Context);
-
             this.Broadcast(this.room).OnLeave(this.myName);
 
             // dummy external operation.
+            var random = new Random();
             using (var activity = mysqlActivity.StartActivity("room/update", ActivityKind.Internal))
             {
                 // this is sample. use orm or any safe way.
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("table", "rooms");
                 activity.SetTag("query", $"UPDATE rooms SET status=0 WHERE id='room' AND name='@username';");
                 activity.SetTag("parameter.room", this.room.GroupName);
@@ -77,6 +80,7 @@ public async Task LeaveAsync()
 
             using (var activity = redisActivity.StartActivity($"member/status", ActivityKind.Internal))
             {
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("command", "set");
                 activity.SetTag("parameter.key", this.myName);
                 activity.SetTag("parameter.value", "0");
@@ -86,13 +90,14 @@ public async Task LeaveAsync()
 
         public async Task SendMessageAsync(string message)
         {
-            var random = new Random();
             var response = new MessageResponse { UserName = this.myName, Message = message };
             this.Broadcast(this.room).OnSendMessage(response);
 
             // dummy external operation.
+            var random = new Random();
             using (var activity = redisActivity.StartActivity($"chat_latest_message", ActivityKind.Internal))
             {
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("command", "set");
                 activity.SetTag("parameter.key", room.GroupName);
                 activity.SetTag("parameter.value", $"{myName}={message}");
@@ -104,13 +109,14 @@ public async Task SendMessageAsync(string message)
 
         public async Task GenerateException(string message)
         {
-            var random = new Random();
             var ex = new Exception(message);
 
             // dummy external operation.
+            var random = new Random();
             using (var activity = mysqlActivity.StartActivity("errors/insert", ActivityKind.Internal))
             {
                 // this is sample. use orm or any safe way.
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("table", "errors");
                 activity.SetTag("query", $"INSERT INTO rooms VALUES ('{ex.Message}', '{ex.StackTrace}');");
                 await Task.Delay(TimeSpan.FromMilliseconds(random.Next(2, 20)));
diff --git a/samples/ChatApp.Telemetry/ChatApp.Server/ChatService.cs b/samples/ChatApp.Telemetry/ChatApp.Server/ChatService.cs
index 4c8e4cb04..2195b313f 100644
--- a/samples/ChatApp.Telemetry/ChatApp.Server/ChatService.cs
+++ b/samples/ChatApp.Telemetry/ChatApp.Server/ChatService.cs
@@ -24,7 +24,7 @@ public ChatService(BackendActivitySources backendActivity, MagicOnionOpenTelemet
         {
             this.options = options;
             this.mysqlSource = backendActivity.Get("mysql");
-            this.s2sSource = backendActivity.Get("chatapp.s2s");
+            this.s2sSource = backendActivity.Get("chatapp.server.s2s");
             this.logger = logger;
         }
 
@@ -35,6 +35,7 @@ public async UnaryResult<Nil> GenerateException(string message)
             using (var activity = this.mysqlSource.StartActivity("errors/insert", ActivityKind.Internal))
             {
                 // this is sample. use orm or any safe way.
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("table", "errors");
                 activity.SetTag("query", $"INSERT INTO rooms VALUES ('{ex.Message}', '{ex.StackTrace}');");
                 await Task.Delay(TimeSpan.FromMilliseconds(2));
@@ -50,13 +51,14 @@ public async UnaryResult<Nil> SendReportAsync(string message)
             using (var activity = this.mysqlSource.StartActivity("report/insert", ActivityKind.Internal))
             {
                 // this is sample. use orm or any safe way.
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("table", "report");
                 activity.SetTag("query", $"INSERT INTO report VALUES ('foo', 'bar');");
                 await Task.Delay(TimeSpan.FromMilliseconds(2));
             }
 
             // Server to Server operation
-            var channel = GrpcChannel.ForAddress("http://localhost:4999");
+            var channel = GrpcChannel.ForAddress(Environment.GetEnvironmentVariable("Server2ServerEndpoint", EnvironmentVariableTarget.Process) ??  "http://localhost:4999");
             var client = MagicOnionClient.Create<IMessageService>(channel, new[]
             {
                 // propagate trace context from ChatApp.Server to MicroServer
@@ -68,6 +70,7 @@ public async UnaryResult<Nil> SendReportAsync(string message)
             using (var activity = this.mysqlSource.StartActivity("report/get", ActivityKind.Internal))
             {
                 // this is sample. use orm or any safe way.
+                activity.SetTag("service.name", options.ServiceName);
                 activity.SetTag("table", "report");
                 activity.SetTag("query", $"INSERT INTO report VALUES ('foo', 'bar');");
                 await Task.Delay(TimeSpan.FromMilliseconds(1));
diff --git a/samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile b/samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile
index 459cab1ff..aa36ba31a 100644
--- a/samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile
+++ b/samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile
@@ -4,11 +4,16 @@ WORKDIR /app
 
 FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
 WORKDIR /src
-COPY ["ChatApp.Server/ChatApp.Server.csproj", "ChatApp.Server/"]
-COPY ["ChatApp.Shared/ChatApp.Shared.csproj", "ChatApp.Shared/"]
-RUN dotnet restore "ChatApp.Server/ChatApp.Server.csproj"
+COPY ["samples/ChatApp.Telemetry/ChatApp.Server/ChatApp.Server.csproj", "samples/ChatApp.Telemetry/ChatApp.Server/"]
+COPY ["samples/ChatApp.Telemetry/ChatApp.Shared/ChatApp.Shared.csproj", "samples/ChatApp.Telemetry/ChatApp.Shared/"]
+COPY ["src/MagicOnion/MagicOnion.csproj", "src/MagicOnion/"]
+COPY ["src/MagicOnion.Abstractions/MagicOnion.Abstractions.csproj", "src/MagicOnion.Abstractions/"]
+COPY ["src/MagicOnion.Server/MagicOnion.Server.csproj", "src/MagicOnion.Server/"]
+COPY ["src/MagicOnion.Server.OpenTelemetry/MagicOnion.Server.OpenTelemetry.csproj", "src/MagicOnion.Server.OpenTelemetry/"]
+COPY ["src/MagicOnion.Shared/MagicOnion.Shared.csproj", "src/MagicOnion.Shared/"]
+RUN dotnet restore "samples/ChatApp.Telemetry/ChatApp.Server/ChatApp.Server.csproj"
 COPY . .
-WORKDIR "/src/ChatApp.Server"
+WORKDIR "/src/samples/ChatApp.Telemetry/ChatApp.Server"
 RUN dotnet build "ChatApp.Server.csproj" -c Debug -o /app
 
 FROM build AS publish
diff --git a/samples/ChatApp.Telemetry/ChatApp.Server/Startup.cs b/samples/ChatApp.Telemetry/ChatApp.Server/Startup.cs
index 411617296..248280fbc 100644
--- a/samples/ChatApp.Telemetry/ChatApp.Server/Startup.cs
+++ b/samples/ChatApp.Telemetry/ChatApp.Server/Startup.cs
@@ -74,7 +74,7 @@ public void ConfigureServices(IServiceCollection services)
                 });
 
             // additional Tracer for user's own service.
-            services.AddAdditionalTracer(Configuration, new[] { "chatapp.s2s", "mysql", "redis" });
+            services.AddAdditionalTracer(Configuration);
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
@@ -108,8 +108,9 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 
     public static class TelemetryExtensions
     {
-        public static void AddAdditionalTracer(this IServiceCollection services, IConfiguration configuration, string[] serviceNames)
+        public static void AddAdditionalTracer(this IServiceCollection services, IConfiguration configuration)
         {
+            var serviceNames = new[] { "chatapp.server.s2s", "mysql", "redis" };
             var exporter = configuration.GetValue<string>("UseExporter").ToLowerInvariant();
             foreach (var service in serviceNames)
             {
@@ -125,6 +126,7 @@ public static void AddAdditionalTracer(this IServiceCollection services, IConfig
                     case "zipkin":
                         OpenTelemetry.Sdk.CreateTracerProviderBuilder()
                             .AddSource(service)
+                            .SetResourceBuilder(ResourceBuilder.CreateDefault().AddService(service))
                             .AddZipkinExporter()
                             .Build();
                         break;
diff --git a/samples/ChatApp.Telemetry/ChatApp.Server/appsettings.json b/samples/ChatApp.Telemetry/ChatApp.Server/appsettings.json
index 51b0218dc..e8bf9f3b3 100644
--- a/samples/ChatApp.Telemetry/ChatApp.Server/appsettings.json
+++ b/samples/ChatApp.Telemetry/ChatApp.Server/appsettings.json
@@ -13,6 +13,7 @@
   },
   "MagicOnion": {
     "OpenTelemetry": {
+      "ServiceName": "ChatApp.Server",
       // "ExposeRpcScope": false,
       "TracingTags": {
         "foo": "bar"
diff --git a/samples/ChatApp.Telemetry/MicroServer.Shared/Class1.cs b/samples/ChatApp.Telemetry/MicroServer.Shared/IMessageService.cs
similarity index 100%
rename from samples/ChatApp.Telemetry/MicroServer.Shared/Class1.cs
rename to samples/ChatApp.Telemetry/MicroServer.Shared/IMessageService.cs
diff --git a/samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile.full b/samples/ChatApp.Telemetry/MicroServer/Dockerfile
similarity index 65%
rename from samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile.full
rename to samples/ChatApp.Telemetry/MicroServer/Dockerfile
index aa36ba31a..c79c2399f 100644
--- a/samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile.full
+++ b/samples/ChatApp.Telemetry/MicroServer/Dockerfile
@@ -4,22 +4,22 @@ WORKDIR /app
 
 FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
 WORKDIR /src
-COPY ["samples/ChatApp.Telemetry/ChatApp.Server/ChatApp.Server.csproj", "samples/ChatApp.Telemetry/ChatApp.Server/"]
+COPY ["samples/ChatApp.Telemetry/MicroServer/MicroServer.csproj", "samples/ChatApp.Telemetry/MicroServer/"]
 COPY ["samples/ChatApp.Telemetry/ChatApp.Shared/ChatApp.Shared.csproj", "samples/ChatApp.Telemetry/ChatApp.Shared/"]
 COPY ["src/MagicOnion/MagicOnion.csproj", "src/MagicOnion/"]
 COPY ["src/MagicOnion.Abstractions/MagicOnion.Abstractions.csproj", "src/MagicOnion.Abstractions/"]
 COPY ["src/MagicOnion.Server/MagicOnion.Server.csproj", "src/MagicOnion.Server/"]
 COPY ["src/MagicOnion.Server.OpenTelemetry/MagicOnion.Server.OpenTelemetry.csproj", "src/MagicOnion.Server.OpenTelemetry/"]
 COPY ["src/MagicOnion.Shared/MagicOnion.Shared.csproj", "src/MagicOnion.Shared/"]
-RUN dotnet restore "samples/ChatApp.Telemetry/ChatApp.Server/ChatApp.Server.csproj"
+RUN dotnet restore "samples/ChatApp.Telemetry/MicroServer/MicroServer.csproj"
 COPY . .
-WORKDIR "/src/samples/ChatApp.Telemetry/ChatApp.Server"
-RUN dotnet build "ChatApp.Server.csproj" -c Debug -o /app
+WORKDIR "/src/samples/ChatApp.Telemetry/MicroServer"
+RUN dotnet build "MicroServer.csproj" -c Debug -o /app
 
 FROM build AS publish
-RUN dotnet publish "ChatApp.Server.csproj" -c Debug -o /app
+RUN dotnet publish "MicroServer.csproj" -c Debug -o /app
 
 FROM base AS final
 WORKDIR /app
 COPY --from=publish /app .
-ENTRYPOINT ["dotnet", "ChatApp.Server.dll"]
\ No newline at end of file
+ENTRYPOINT ["dotnet", "MicroServer.dll"]
\ No newline at end of file
diff --git a/samples/ChatApp.Telemetry/MicroServer/MessageService.cs b/samples/ChatApp.Telemetry/MicroServer/MessageService.cs
index 484367df1..4a1a12c93 100644
--- a/samples/ChatApp.Telemetry/MicroServer/MessageService.cs
+++ b/samples/ChatApp.Telemetry/MicroServer/MessageService.cs
@@ -1,6 +1,5 @@
 using MagicOnion;
 using MagicOnion.Server;
-using MessagePack;
 using MicroServer.Shared;
 using System;
 using System.Threading.Tasks;
diff --git a/samples/ChatApp.Telemetry/MicroServer/appsettings.json b/samples/ChatApp.Telemetry/MicroServer/appsettings.json
index 0d5b82025..cb6023ee6 100644
--- a/samples/ChatApp.Telemetry/MicroServer/appsettings.json
+++ b/samples/ChatApp.Telemetry/MicroServer/appsettings.json
@@ -13,6 +13,8 @@
   },
   "MagicOnion": {
     "OpenTelemetry": {
+      "ServiceName": "MicroServer",
+      // "ExposeRpcScope": false,
       "TracingTags": {
         "foo": "bar"
       }
diff --git a/samples/ChatApp.Telemetry/README.md b/samples/ChatApp.Telemetry/README.md
index 76fc07b39..ded15a662 100644
--- a/samples/ChatApp.Telemetry/README.md
+++ b/samples/ChatApp.Telemetry/README.md
@@ -4,27 +4,24 @@ This is Sample to run MagicOnion with OpenTelemetry implementation.
 
 ## Getting started
 
-To run simple ChatApp.Server, 
+Option1. Run ChatApp.Server on VisualStudio, and run zipkin, jeager in docker.
 
 1. Run `docker-compose -f docker-compose.telemetry.yaml up`.
 1. Launch `ChatApp.Server.Telemetry` from VisualStudio.  
-1. Run `ChatScene` from UnityEditor.  
+1. Launch UnityEditor for `sample/ChatApp/ChatApp.Unity`, open `ChatScene` then do any operations.
 1. Access Telemery's Web UI.
 
-Server and Telemetries are fully containernized.
+Option2. Run all ChatApp.Server, zipkin and jeager in container
 
 1. Run `docker-compose -f docker-compose.yaml -f docker-compose.telemetry.yaml up`.
-1. Run `ChatScene` from UnityEditor. 
+1. Launch UnityEditor for `sample/ChatApp/ChatApp.Unity`, open `ChatScene` then do any operations.
 1. Access Telemery's Web UI.
 
-Telemetry's Web UI address.
+Telemetry's Web UI address. (default send to jeager)
 
 * [jaeger](http://localhost:16686/)
 * [zipkin](http://localhost:9411/)
-    * no data on default. you can switch with jaeger.
-* [prometheus](http://localhost:9090/)
-* [grafana](http://localhost:3000/)
-    * user/password is `admin/admin`.
+    * no data on default. you can switch by appsettings.json
 
 ## Projects
 
@@ -34,6 +31,8 @@ There are 3 projects for this sample.
 1. ChatApp.Shared (samples/ChatApp.Telemetry/)
 1. ChatApp.Unity (samples/ChatApp/)
 
+and optional Server to Server 
+
 **ChatApp.Server** is Serverside MagicOnion implementation with OpenTelemetry. 
 
 **ChatApp.Shared** is class library shared with both ChatApp.Server and ChatApp.Unity.
diff --git a/samples/ChatApp.Telemetry/docker-compose.telemetry.yaml b/samples/ChatApp.Telemetry/docker-compose.telemetry.yaml
index daaa118b6..b21502795 100644
--- a/samples/ChatApp.Telemetry/docker-compose.telemetry.yaml
+++ b/samples/ChatApp.Telemetry/docker-compose.telemetry.yaml
@@ -65,3 +65,14 @@ services:
     ports:
       - 6831:6831/udp # client post
       - 16686:16686 # web
+
+  # Server to Server
+  microserver:
+    image: cysharp/magiconion_sample_chatapp_microserver:4.3.1-1.0.0.rc4
+    environment:
+      - DOTNET_ENVIRONMENT=Development
+      - UseExporter=jaeger
+      - Jaeger__AgentHost=jaeger
+      - Zipkin__Endpoint=http://zipkin:9411/api/v2/spans
+    ports:
+      - 4999:80
diff --git a/samples/ChatApp.Telemetry/docker-compose.yaml b/samples/ChatApp.Telemetry/docker-compose.yaml
index 963820271..509ecf6f2 100644
--- a/samples/ChatApp.Telemetry/docker-compose.yaml
+++ b/samples/ChatApp.Telemetry/docker-compose.yaml
@@ -5,11 +5,9 @@ services:
     image: cysharp/magiconion_sample_chatapp_telemetry:4.3.1-1.0.0.rc4
     ports:
       - 5000:80
-      - 9184:9184
     environment:
       - DOTNET_ENVIRONMENT=Development
-      - MagicOnion__OpenTelemetry__MetricsExporterEndpoint=http://127.0.0.1:9184/metrics/
-      - MagicOnion__OpenTelemetry__MetricsExporterHostingEndpoint=http://+:9184/metrics/
       - UseExporter=jaeger
-      - Jaeger__Host=jaeger
+      - Jaeger__AgentHost=jaeger
       - Zipkin__Endpoint=http://zipkin:9411/api/v2/spans
+      - Server2ServerEndpoint=http://microserver:80
diff --git a/samples/ChatApp.Telemetry/docker_build.bat b/samples/ChatApp.Telemetry/docker_build.bat
index 7c5aa69ca..9421d1430 100644
--- a/samples/ChatApp.Telemetry/docker_build.bat
+++ b/samples/ChatApp.Telemetry/docker_build.bat
@@ -1,3 +1,5 @@
 :: run from Repository Root
 :: cysharp/magiconion_sample_chatapp_telemetry
-docker build -t chatapp_magiconion:latest -f samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile.full .
+:: cysharp/magiconion_sample_microserver
+docker build -t chatapp_magiconion:latest -f samples/ChatApp.Telemetry/ChatApp.Server/Dockerfile .
+docker build -t chatapp_microserver:latest -f samples/ChatApp.Telemetry/MicroServer/Dockerfile .
diff --git a/samples/ChatApp.Telemetry/docker_push.bat b/samples/ChatApp.Telemetry/docker_push.bat
index a8012b1c3..fd7bac9dc 100644
--- a/samples/ChatApp.Telemetry/docker_push.bat
+++ b/samples/ChatApp.Telemetry/docker_push.bat
@@ -4,3 +4,8 @@ docker tag chatapp_magiconion:latest cysharp/magiconion_sample_chatapp_telemetry
 docker tag chatapp_magiconion:latest cysharp/magiconion_sample_chatapp_telemetry:4.3.1-1.0.0.rc4
 docker push cysharp/magiconion_sample_chatapp_telemetry:latest
 docker push cysharp/magiconion_sample_chatapp_telemetry:4.3.1-1.0.0.rc4
+
+docker tag chatapp_microserver:latest cysharp/magiconion_sample_chatapp_microserver:latest
+docker tag chatapp_microserver:latest cysharp/magiconion_sample_chatapp_microserver:4.3.1-1.0.0.rc4
+docker push cysharp/magiconion_sample_chatapp_microserver:latest
+docker push cysharp/magiconion_sample_chatapp_microserver:4.3.1-1.0.0.rc4
diff --git a/samples/ChatApp.Telemetry/docker_run.bat b/samples/ChatApp.Telemetry/docker_run.bat
index 9a2943f1d..1f003ddfa 100644
--- a/samples/ChatApp.Telemetry/docker_run.bat
+++ b/samples/ChatApp.Telemetry/docker_run.bat
@@ -1 +1 @@
-docker-compose -f docker-compose.yaml -f docker-compose.telemetry.yaml up
\ No newline at end of file
+docker-compose -f docker-compose.yaml -f docker-compose.telemetry.yaml up
diff --git a/src/MagicOnion.Server.OpenTelemetry/Internal/OpenTelemetryHelper.cs b/src/MagicOnion.Server.OpenTelemetry/Internal/OpenTelemetryHelper.cs
index c1e00117f..6f7b69f5e 100644
--- a/src/MagicOnion.Server.OpenTelemetry/Internal/OpenTelemetryHelper.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/Internal/OpenTelemetryHelper.cs
@@ -2,7 +2,7 @@
 
 namespace MagicOnion.Server.OpenTelemetry.Internal
 {
-    public static class OpenTelemetryHelper
+    internal static class OpenTelemetryHelper
     {
         /// <summary>
         /// Convert gRPC StatusCode to OpenTelemetry Status.
diff --git a/src/MagicOnion.Server.OpenTelemetry/Internal/SemanticConventions.cs b/src/MagicOnion.Server.OpenTelemetry/Internal/SemanticConventions.cs
index d84eaf494..0b1eaf195 100644
--- a/src/MagicOnion.Server.OpenTelemetry/Internal/SemanticConventions.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/Internal/SemanticConventions.cs
@@ -6,6 +6,7 @@ namespace MagicOnion.Server.OpenTelemetry.Internal
     internal static class SemanticConventions
     {
         // tag spec: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/semantic_conventions/rpc.md#grpc
+        public const string AttributeServiceName = "service.name";
         public const string AttributeException = "exception";
 
         public const string AttributeHttpHost = "http.host";
diff --git a/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryClientFilter.cs b/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryClientFilter.cs
index b9b3e3502..8b72dbe1d 100644
--- a/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryClientFilter.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryClientFilter.cs
@@ -27,7 +27,7 @@ public MagicOnionOpenTelemetryClientFilter(ActivitySource activitySource, MagicO
         public async ValueTask<ResponseContext> SendAsync(RequestContext context, Func<RequestContext, ValueTask<ResponseContext>> next)
         {
             var rpcService = context.MethodPath.Split('/')[0];
-            using var rpcScope = new ClientRpcScope(rpcService, context.MethodPath, context, source);
+            using var rpcScope = new ClientRpcScope(rpcService, context.MethodPath, context, source, options);
             rpcScope.SetTags(options.TracingTags);
 
             try
@@ -51,7 +51,8 @@ public async ValueTask<ResponseContext> SendAsync(RequestContext context, Func<R
 
     internal class ClientRpcScope : RpcScope
     {
-        public ClientRpcScope(string rpcService, string rpcMethod, RequestContext context, ActivitySource source) : base(rpcService, rpcMethod)
+        public ClientRpcScope(string rpcService, string rpcMethod, RequestContext context, ActivitySource source, MagicOnionOpenTelemetryOptions options)
+            : base(rpcService, rpcMethod, options.ServiceName)
         {
             // capture the current activity
             this.ParentActivity = Activity.Current;
diff --git a/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryOption.cs b/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryOption.cs
index 16462c263..c531c0d3d 100644
--- a/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryOption.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryOption.cs
@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 
 namespace MagicOnion.Server.OpenTelemetry
@@ -9,13 +8,19 @@ namespace MagicOnion.Server.OpenTelemetry
     public class MagicOnionOpenTelemetryOptions
     {
         /// <summary>
-        /// Application specific OpenTelemetry Tracing tags
+        /// ServiceName for Tracer. Especially Zipkin use service.name tag to identify service name.
         /// </summary>
-        public Dictionary<string, string> TracingTags { get; set; } = new Dictionary<string, string>();
+        /// <remarks>input to tag `service.name`</remarks>
+        public string ServiceName { get; set; }
 
         /// <summary>
         /// Expose RpsScope to the ServiceContext.Items. RpsScope key begin with .TraceContext
         /// </summary>
         public bool ExposeRpcScope { get; set; } = true;
+
+        /// <summary>
+        /// Application specific OpenTelemetry Tracing tags
+        /// </summary>
+        public Dictionary<string, string> TracingTags { get; set; } = new Dictionary<string, string>();
     }
 }
\ No newline at end of file
diff --git a/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryTracerFilterAttributes.cs b/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryTracerFilterAttributes.cs
index 9cfd1dd65..1ef65c798 100644
--- a/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryTracerFilterAttributes.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/MagicOnionOpenTelemetryTracerFilterAttributes.cs
@@ -40,7 +40,7 @@ public MagicOnionOpenTelemetryTracerFilterAttribute(ActivitySource activitySourc
 
         public override async ValueTask Invoke(ServiceContext context, Func<ServiceContext, ValueTask> next)
         {
-            using var rpcScope = new ServerRpcScope(context.ServiceType.Name, context.CallContext.Method.TrimStart('/'), context.CallContext, source);
+            using var rpcScope = new ServerRpcScope(context.ServiceType.Name, context.CallContext.Method.TrimStart('/'), context.CallContext, source, options);
 
             if (options.ExposeRpcScope)
             {
@@ -114,7 +114,7 @@ public MagicOnionOpenTelemetryStreamingTracerFilterAttribute(ActivitySource acti
 
         public override async ValueTask Invoke(StreamingHubContext context, Func<StreamingHubContext, ValueTask> next)
         {
-            using var rpcScope = new ServerRpcScope(context.ServiceContext.ServiceType.Name, context.Path, context.ServiceContext.CallContext, source);
+            using var rpcScope = new ServerRpcScope(context.ServiceContext.ServiceType.Name, context.Path, context.ServiceContext.CallContext, source, options);
 
             if (options.ExposeRpcScope)
             {
@@ -161,8 +161,8 @@ public override async ValueTask Invoke(StreamingHubContext context, Func<Streami
 
     internal class ServerRpcScope : RpcScope
     {
-
-        public ServerRpcScope(string rpcService, string rpcMethod, ServerCallContext context, ActivitySource source) : base(rpcService, rpcMethod)
+        public ServerRpcScope(string rpcService, string rpcMethod, ServerCallContext context, ActivitySource source, MagicOnionOpenTelemetryOptions options) 
+            : base(rpcService, rpcMethod, options.ServiceName)
         {
             // activity may be null if "no one is listening" or "all listener returns ActivitySamplingResult.None in Sample or SampleUsingParentId callback".
             if (!source.HasListeners())
diff --git a/src/MagicOnion.Server.OpenTelemetry/MagicOnionServerBuilderExtensions.cs b/src/MagicOnion.Server.OpenTelemetry/MagicOnionServerBuilderExtensions.cs
index f5e55c086..7551f4a41 100644
--- a/src/MagicOnion.Server.OpenTelemetry/MagicOnionServerBuilderExtensions.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/MagicOnionServerBuilderExtensions.cs
@@ -42,7 +42,6 @@ public static IMagicOnionServerBuilder AddOpenTelemetry(this IMagicOnionServerBu
             var serviceProvider = builder.Services.BuildServiceProvider();
             var activityName = MagicOnionInstrumentation.ActivitySourceName;
 
-
             // Configure OpenTelemetry Tracer
             if (configureTracerProvider != null)
             {
diff --git a/src/MagicOnion.Server.OpenTelemetry/RpcScope.cs b/src/MagicOnion.Server.OpenTelemetry/RpcScope.cs
index e83045195..fc78fdb77 100644
--- a/src/MagicOnion.Server.OpenTelemetry/RpcScope.cs
+++ b/src/MagicOnion.Server.OpenTelemetry/RpcScope.cs
@@ -26,12 +26,14 @@ internal abstract class RpcScope : IDisposable, IRpcScope
 
         protected string RpcService { get; }
         protected string RpcMethod { get; }
+        protected string ServiceName { get; }
         protected Activity ParentActivity { get; set; }
 
-        protected RpcScope(string rpcService, string rpcMethod)
+        protected RpcScope(string rpcService, string rpcMethod, string serviceName)
         {
             RpcService = rpcService;
             RpcMethod = rpcMethod;
+            ServiceName = serviceName;
         }
 
         /// <summary>
@@ -96,6 +98,7 @@ protected void SetActivity(Activity activity)
                 return;
             }
 
+            this.activity.SetTag(SemanticConventions.AttributeServiceName, ServiceName);
             this.activity.SetTag(SemanticConventions.AttributeRpcSystem, "grpc");
             this.activity.SetTag(SemanticConventions.AttributeRpcService, RpcService);
             this.activity.SetTag(SemanticConventions.AttributeRpcMethod, RpcMethod);