diff --git a/whispering/cli.py b/whispering/cli.py
index 7b68f14..8c1641a 100644
--- a/whispering/cli.py
+++ b/whispering/cli.py
@@ -4,6 +4,7 @@ import argparse
 import asyncio
 import queue
 import sys
+from enum import Enum
 from logging import DEBUG, INFO, basicConfig, getLogger
 from typing import Optional, Union
 
@@ -22,6 +23,15 @@ from whispering.websocket_client import run_websocket_client
 logger = getLogger(__name__)
 
 
+class Mode(Enum):
+    client = "client"
+    server = "server"
+    mic = "mic"
+
+    def __str__(self):
+        return self.value
+
+
 def transcribe_from_mic(
     *,
     wsp: WhisperStreamingTranscriber,
@@ -151,7 +161,7 @@ def get_opts() -> argparse.Namespace:
     )
     group_ctx.add_argument(
         "--mode",
-        choices=["client"],
+        choices=[v.value for v in Mode],
     )
 
     group_misc = parser.add_argument_group("Other options")
@@ -225,31 +235,33 @@ def main() -> None:
     if opts.show_devices:
         return show_devices()
 
-    if opts.host is not None and opts.port is not None:
-        if opts.mode == "client":
-            assert opts.language is None
-            assert opts.model is None
-            try:
-                asyncio.run(
-                    run_websocket_client(
-                        opts=opts,
-                    )
-                )
-            except KeyboardInterrupt:
-                pass
-        else:
-            assert opts.language is not None
-            assert opts.model is not None
-            wsp = get_wshiper(opts=opts)
-            ctx: Context = get_context(opts=opts)
+    if opts.host is not None and opts.port is not None and opts.mode != Mode.client:
+        opts.mode = Mode.server
+
+    if opts.mode == Mode.client:
+        assert opts.language is None
+        assert opts.model is None
+        try:
             asyncio.run(
-                serve_with_websocket(
-                    wsp=wsp,
-                    host=opts.host,
-                    port=opts.port,
-                    ctx=ctx,
+                run_websocket_client(
+                    opts=opts,
                 )
             )
+        except KeyboardInterrupt:
+            pass
+    elif opts.mode == Mode.server:
+        assert opts.language is not None
+        assert opts.model is not None
+        wsp = get_wshiper(opts=opts)
+        ctx: Context = get_context(opts=opts)
+        asyncio.run(
+            serve_with_websocket(
+                wsp=wsp,
+                host=opts.host,
+                port=opts.port,
+                ctx=ctx,
+            )
+        )
     else:
         assert opts.language is not None
         assert opts.model is not None