diff --git a/sdk/voice/speechmatics/voice/_client.py b/sdk/voice/speechmatics/voice/_client.py
index f4e96607..44a5ca46 100644
--- a/sdk/voice/speechmatics/voice/_client.py
+++ b/sdk/voice/speechmatics/voice/_client.py
@@ -472,12 +472,15 @@ def _prepare_config(
     # LIFECYCLE METHODS
     # ============================================================================
 
-    async def connect(self) -> None:
+    async def connect(self, ws_headers: Optional[dict] = None) -> None:
         """Connect to the Speechmatics API.
 
         Establishes WebSocket connection and starts the transcription session.
         This must be called before sending audio.
 
+        Args:
+            ws_headers: Optional headers to pass to the WebSocket connection.
+
         Raises:
             Exception: If connection fails.
 
@@ -521,6 +524,7 @@ async def connect(self) -> None:
             await self.start_session(
                 transcription_config=self._transcription_config,
                 audio_format=self._audio_format,
+                ws_headers=ws_headers,
             )
             self._is_connected = True
             self._start_metrics_task()
diff --git a/tests/voice/test_06_stt_config.py b/tests/voice/test_06_stt_config.py
index cc7b3cac..77e44ab4 100644
--- a/tests/voice/test_06_stt_config.py
+++ b/tests/voice/test_06_stt_config.py
@@ -1,8 +1,78 @@
+import os
+
 import pytest
+from _utils import get_client
+
+# Constants
+API_KEY = os.getenv("SPEECHMATICS_API_KEY")
+
+
+@pytest.mark.asyncio
+async def test_with_headers():
+    """Tests that a client can be created.
+
+    - Checks for a valid session
+    - Checks that 'English' is the language pack info
+    """
+
+    # API key
+    if not API_KEY:
+        pytest.skip("Valid API key required for test")
+
+    # Create client
+    client = await get_client(
+        api_key=API_KEY,
+        connect=False,
+    )
+
+    # Headers
+    ws_headers = {"Z-TEST-HEADER-1": "ValueOne", "Z-TEST-HEADER-2": "ValueTwo"}
+
+    # Check we are connected OK
+    await client.connect(ws_headers=ws_headers)
+
+    # Check we are connected
+    assert client._is_connected
+
+    # Disconnect
+    await client.disconnect()
+
+    # Check we are disconnected
+    assert not client._is_connected
 
 
 @pytest.mark.asyncio
-async def test_no_partials():
-    """Tests for STT config (no partials)."""
+async def test_with_corrupted_headers():
+    """Tests that a client can be created.
+
+    - Checks for a valid session
+    - Checks that 'English' is the language pack info
+    """
+
+    # API key
+    if not API_KEY:
+        pytest.skip("Valid API key required for test")
+
+    # Create client
+    client = await get_client(
+        api_key=API_KEY,
+        connect=False,
+    )
+
+    # Headers
+    ws_headers = ["ItemOne", "ItemTwo"]
+
+    # Check we are connected OK
+    try:
+        await client.connect(ws_headers=ws_headers)
+    except AttributeError:
+        pass
+
+    # Check we are connected
+    assert not client._is_connected
+
+    # Disconnect (in case connected)
+    await client.disconnect()
 
-    pass
+    # Check we are disconnected
+    assert not client._is_connected