diff --git a/app.py b/app.py
index 6daed2a..07f65c5 100644
--- a/app.py
+++ b/app.py
@@ -78,6 +78,7 @@ async def dashboard(request: Request):
             row = conn.execute("""
                 SELECT u.display_name, u.azure_id,
                        s.last_aida_status, s.last_teams_status,
+                       COALESCE(s.phone_active, 0) as phone_active,
                        cr_aida.r as ar, cr_aida.g as ag, cr_aida.b as ab,
                        cr_teams.r as tr, cr_teams.g as tg, cr_teams.b as tb
                 FROM assignments a
@@ -89,8 +90,12 @@ async def dashboard(request: Request):
             """, (dev["id"], seg_idx)).fetchone()
 
             if row:
-                # Use teams color if anwesend, otherwise aida color
-                if row["last_aida_status"] == "anwesend" and row["tr"] is not None:
+                phone = row["phone_active"]
+                if phone:
+                    # Phone active: show phone color
+                    pc = conn.execute("SELECT r,g,b FROM color_rules WHERE status='phone_active'").fetchone()
+                    r, g, b = (pc["r"], pc["g"], pc["b"]) if pc else (255, 0, 0)
+                elif row["last_aida_status"] == "anwesend" and row["tr"] is not None:
                     r, g, b = row["tr"], row["tg"], row["tb"]
                 elif row["ar"] is not None:
                     r, g, b = row["ar"], row["ag"], row["ab"]
@@ -101,6 +106,7 @@ async def dashboard(request: Request):
                     "user": row["display_name"],
                     "aida": row["last_aida_status"] or "-",
                     "teams": row["last_teams_status"] or "-",
+                    "phone": phone,
                     "r": r, "g": g, "b": b,
                 })
             else:
@@ -167,12 +173,13 @@ async def sync_users():
 async def update_user(
     azure_id: str,
     personal_nr: str = Form(""),
+    phone_extension: str = Form(""),
     active: str = Form("0"),
 ):
     conn = database.get_db()
     conn.execute(
-        "UPDATE users SET personal_nr=?, active=? WHERE azure_id=?",
-        (personal_nr, 1 if active == "1" else 0, azure_id),
+        "UPDATE users SET personal_nr=?, phone_extension=?, active=? WHERE azure_id=?",
+        (personal_nr, phone_extension, 1 if active == "1" else 0, azure_id),
     )
     conn.commit()
     conn.close()
@@ -471,8 +478,20 @@ def cli_auth():
 
 if __name__ == "__main__":
     import uvicorn
+    import threading
 
     if len(sys.argv) > 1 and sys.argv[1] == "--auth":
         cli_auth()
     else:
+        # Start webhook server on port 8081 in background thread
+        from webhook import webhook_app
+
+        def run_webhook():
+            uvicorn.run(webhook_app, host="0.0.0.0", port=8081, log_level="info")
+
+        webhook_thread = threading.Thread(target=run_webhook, daemon=True)
+        webhook_thread.start()
+        logger.info("Webhook-Server gestartet auf Port 8081")
+
+        # Main web UI on port 8080
         uvicorn.run(app, host="0.0.0.0", port=8080)
diff --git a/database.py b/database.py
index e814b61..a54f2ed 100644
--- a/database.py
+++ b/database.py
@@ -25,6 +25,7 @@ def init_db():
             display_name TEXT NOT NULL DEFAULT '',
             email TEXT DEFAULT '',
             personal_nr TEXT DEFAULT '',
+            phone_extension TEXT DEFAULT '',
             active INTEGER NOT NULL DEFAULT 0
         );
 
@@ -60,6 +61,7 @@ def init_db():
             user_azure_id TEXT PRIMARY KEY REFERENCES users(azure_id) ON DELETE CASCADE,
             last_aida_status TEXT DEFAULT '',
             last_teams_status TEXT DEFAULT '',
+            phone_active INTEGER DEFAULT 0,
             updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
         );
 
@@ -92,6 +94,14 @@ def init_db():
         conn.execute("ALTER TABLE wled_devices ADD COLUMN last_check TIMESTAMP")
     except Exception:
         pass
+    try:
+        conn.execute("ALTER TABLE users ADD COLUMN phone_extension TEXT DEFAULT ''")
+    except Exception:
+        pass
+    try:
+        conn.execute("ALTER TABLE state ADD COLUMN phone_active INTEGER DEFAULT 0")
+    except Exception:
+        pass
 
     defaults = {
         "azure_client_id": "",
@@ -129,6 +139,7 @@ def init_db():
         ("teams_inactive", 0, 255, 0, ""),
         ("teams_offwork", 0, 255, 0, ""),
         ("teams_outofoffice", 0, 255, 0, ""),
+        ("phone_active", 255, 0, 0, ""),
     ]
     for status, r, g, b, effect in default_colors:
         conn.execute(
diff --git a/scheduler.py b/scheduler.py
index 422eceb..48d5c76 100644
--- a/scheduler.py
+++ b/scheduler.py
@@ -90,7 +90,8 @@ def poll_status():
         users_with_assignments = conn.execute("""
             SELECT u.azure_id, u.display_name, u.personal_nr,
                    a.segment, d.hostname,
-                   s.last_aida_status, s.last_teams_status
+                   s.last_aida_status, s.last_teams_status,
+                   COALESCE(s.phone_active, 0) as phone_active
             FROM users u
             JOIN assignments a ON a.user_azure_id = u.azure_id
             JOIN wled_devices d ON d.id = a.wled_device_id
@@ -130,6 +131,7 @@ def _process_user(user, aida_lines, settings, conn):
     segment = user["segment"]
     last_aida = user["last_aida_status"] or ""
     last_teams = user["last_teams_status"] or ""
+    phone_active = user["phone_active"]
 
     # Immer Teams-Status abfragen (fuer Dashboard-Anzeige)
     teams_status = ""
@@ -144,8 +146,8 @@ def _process_user(user, aida_lines, settings, conn):
     if aida_status == last_aida and teams_status == last_teams:
         return  # No change
 
-    # --- WLED nur steuern wenn AIDA-Status bekannt ---
-    wled_changed = aida_status is not None and (
+    # --- WLED nur steuern wenn AIDA-Status bekannt und kein aktives Telefonat ---
+    wled_changed = aida_status is not None and not phone_active and (
         aida_status != last_aida or
         (aida_status == "anwesend" and teams_status != last_teams)
     )
diff --git a/templates/dashboard.html b/templates/dashboard.html
index 8f5e244..bd82efb 100644
--- a/templates/dashboard.html
+++ b/templates/dashboard.html
@@ -81,6 +81,10 @@
                                     <span class="badge bg-light text-dark"><i class="bi bi-microsoft-teams"></i> {{ seg.teams }}</span>
                                 {% endif %}
                             {% endif %}
+
+                            {% if seg.phone %}
+                                <span class="badge bg-danger"><i class="bi bi-telephone-fill"></i> Telefoniert</span>
+                            {% endif %}
                         </div>
                         {% endif %}
                     {% else %}
diff --git a/templates/users.html b/templates/users.html
index 6581b10..0518e70 100644
--- a/templates/users.html
+++ b/templates/users.html
@@ -35,6 +35,7 @@
                         <th>Name</th>
                         <th>E-Mail</th>
                         <th>Personal-Nr (AIDA)</th>
+                        <th>Durchwahl</th>
                         <th>Zuordnung</th>
                         <th>Aktionen</th>
                     </tr>
@@ -57,6 +58,19 @@
                                        class="form-control form-control-sm" style="width: 120px;"
                                        placeholder="~~00000~~">
                                 <input type="hidden" name="active" value="{{ '1' if user.active else '0' }}">
+                                <input type="hidden" name="phone_extension" value="{{ user.phone_extension or '' }}">
+                                <button type="submit" class="btn btn-sm btn-outline-secondary">
+                                    <i class="bi bi-check"></i>
+                                </button>
+                            </form>
+                        </td>
+                        <td>
+                            <form method="post" action="/api/users/{{ user.azure_id }}/update" class="d-flex gap-1">
+                                <input type="text" name="phone_extension" value="{{ user.phone_extension or '' }}"
+                                       class="form-control form-control-sm" style="width: 80px;"
+                                       placeholder="z.B. 123">
+                                <input type="hidden" name="personal_nr" value="{{ user.personal_nr or '' }}">
+                                <input type="hidden" name="active" value="{{ '1' if user.active else '0' }}">
                                 <button type="submit" class="btn btn-sm btn-outline-secondary">
                                     <i class="bi bi-check"></i>
                                 </button>
diff --git a/webhook.py b/webhook.py
new file mode 100644
index 0000000..e150784
--- /dev/null
+++ b/webhook.py
@@ -0,0 +1,126 @@
+"""Webhook server for phone system integration (runs on port 8081)."""
+
+import logging
+from datetime import datetime
+from fastapi import FastAPI
+from fastapi.responses import PlainTextResponse
+
+from database import get_db, log_activity
+from wled_client import build_wled_url, call_wled
+
+logger = logging.getLogger(__name__)
+
+webhook_app = FastAPI(title="Busylight Webhook")
+
+
+def _get_user_by_extension(extension, conn):
+    """Find user and their assignment by phone extension."""
+    return conn.execute("""
+        SELECT u.azure_id, u.display_name,
+               a.segment, d.hostname,
+               s.last_aida_status, s.last_teams_status, s.phone_active
+        FROM users u
+        JOIN assignments a ON a.user_azure_id = u.azure_id
+        JOIN wled_devices d ON d.id = a.wled_device_id
+        LEFT JOIN state s ON s.user_azure_id = u.azure_id
+        WHERE u.phone_extension = ? AND u.active = 1
+    """, (extension,)).fetchone()
+
+
+def _get_color(status, conn):
+    """Get color for a status."""
+    row = conn.execute(
+        "SELECT r, g, b, effect FROM color_rules WHERE status = ?", (status,)
+    ).fetchone()
+    if row:
+        return dict(row)
+    return {"r": 200, "g": 200, "b": 200, "effect": ""}
+
+
+@webhook_app.get("/{extension}/callstart", response_class=PlainTextResponse)
+@webhook_app.post("/{extension}/callstart", response_class=PlainTextResponse)
+async def call_start(extension: str):
+    conn = get_db()
+    try:
+        user = _get_user_by_extension(extension, conn)
+        if not user:
+            logger.warning("Webhook callstart: Durchwahl %s nicht gefunden", extension)
+            return f"Unknown extension: {extension}"
+
+        aida = user["last_aida_status"] or ""
+        # Nur wenn anwesend oder homeoffice
+        if aida not in ("anwesend", "homeoffice"):
+            logger.info("Webhook callstart: %s ignoriert (AIDA=%s)", user["display_name"], aida)
+            return f"Ignored: {user['display_name']} not in office (aida={aida})"
+
+        # WLED auf Telefon-Farbe setzen
+        color = _get_color("phone_active", conn)
+        url = build_wled_url(
+            user["hostname"], color["r"], color["g"], color["b"],
+            segment=user["segment"], effect=color.get("effect", ""),
+        )
+        success, result_text = call_wled(url)
+
+        # phone_active Flag setzen
+        conn.execute("""
+            UPDATE state SET phone_active=1, updated_at=? WHERE user_azure_id=?
+        """, (datetime.now(), user["azure_id"]))
+        conn.commit()
+
+        log_activity(
+            user["azure_id"], user["display_name"],
+            aida, "phone_active", url, result_text,
+        )
+
+        logger.info("Webhook callstart: %s -> %s", user["display_name"], result_text)
+        return f"OK: {user['display_name']} call started"
+
+    finally:
+        conn.close()
+
+
+@webhook_app.get("/{extension}/callend", response_class=PlainTextResponse)
+@webhook_app.post("/{extension}/callend", response_class=PlainTextResponse)
+async def call_end(extension: str):
+    conn = get_db()
+    try:
+        user = _get_user_by_extension(extension, conn)
+        if not user:
+            logger.warning("Webhook callend: Durchwahl %s nicht gefunden", extension)
+            return f"Unknown extension: {extension}"
+
+        aida = user["last_aida_status"] or ""
+        if aida not in ("anwesend", "homeoffice"):
+            return f"Ignored: {user['display_name']} not in office"
+
+        # Farbe zuruecksetzen basierend auf aktuellem Status
+        teams = user["last_teams_status"] or ""
+        if aida == "homeoffice":
+            color = _get_color("homeoffice", conn)
+        elif teams:
+            color = _get_color(teams, conn)
+        else:
+            color = _get_color("available", conn)
+
+        url = build_wled_url(
+            user["hostname"], color["r"], color["g"], color["b"],
+            segment=user["segment"], effect=color.get("effect", ""),
+        )
+        success, result_text = call_wled(url)
+
+        # phone_active Flag zuruecksetzen
+        conn.execute("""
+            UPDATE state SET phone_active=0, updated_at=? WHERE user_azure_id=?
+        """, (datetime.now(), user["azure_id"]))
+        conn.commit()
+
+        log_activity(
+            user["azure_id"], user["display_name"],
+            aida, f"phone_end -> {teams}", url, result_text,
+        )
+
+        logger.info("Webhook callend: %s -> %s (%s)", user["display_name"], result_text, teams)
+        return f"OK: {user['display_name']} call ended"
+
+    finally:
+        conn.close()