diff --git a/.gitignore b/.gitignore
index 7922b4e..d041eb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 # Secrets - never commit!
 .env
+kamailio/kamailio-local.cfg
 
 # Local development
 *.log
diff --git a/README.md b/README.md
index 3db6e58..2918d33 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,11 @@ Docker Compose Stack für **toppyr.de** — Self-Hosted Collaboration Suite.
 │ Gitea │  │OpenProj.│ │  XWiki  │ │ Postiz  │  │  Monitoring   │
 │ repo. │  │ project.│ │  wiki.  │ │ postiz. │  │ status./netd. │
 └───────┘  └─────────┘ └─────────┘ └─────────┘  └───────────────┘
+
+    ┌─────────────────────────────────────────────────────────┐
+    │          Kamailio SIP Proxy (TCP, TLS via Traefik)      │
+    │                    sip.toppyr.de:5061                    │
+    └─────────────────────────────────────────────────────────┘
 ```
 
 ## 📦 Services
@@ -39,6 +44,7 @@ Docker Compose Stack für **toppyr.de** — Self-Hosted Collaboration Suite.
 | **Uptime Kuma** | status.toppyr.de | Monitoring, Alerts |
 | **Netdata** | netdata.toppyr.de | System Metrics |
 | **lldap** | ldap.toppyr.de | LDAP Directory |
+| **Kamailio** | sip.toppyr.de:5061 | SIP Proxy (Dotty Phone) |
 
 ## 🚀 Deployment
 
@@ -46,7 +52,7 @@ Docker Compose Stack für **toppyr.de** — Self-Hosted Collaboration Suite.
 
 - Docker & Docker Compose v2
 - Domain mit DNS-Einträgen auf Server-IP
-- Ports 80, 443, 2222 (SSH für Gitea) offen
+- Ports 80, 443, 2222 (SSH für Gitea), 5061 (SIP TLS) offen
 
 ### Installation
 
@@ -70,7 +76,7 @@ Alle Subdomains als A-Record auf die Server-IP:
 
 ```
 @, www, sso, wiki, project, status, crm, marketing, support, 
-postiz, ldap, netdata, gruen, cloud, repo → <SERVER_IP>
+postiz, ldap, netdata, gruen, cloud, repo, sip → <SERVER_IP>
 ```
 
 ## 🔐 Authentifizierung
@@ -86,6 +92,9 @@ toppyr-stack/
 ├── docker-compose.yml      # Hauptkonfiguration
 ├── .env.example            # Umgebungsvariablen-Template
 ├── .env                    # Echte Secrets (nicht committed!)
+├── kamailio/
+│   ├── kamailio.cfg            # SIP Proxy Config (TCP-only)
+│   └── kamailio-local.cfg.example  # Credentials-Template
 ├── landing/
 │   └── index.html          # Landing Page toppyr.de
 └── webhooks/
diff --git a/docker-compose.yml b/docker-compose.yml
index 41ac8f4..d68129d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -27,9 +27,11 @@ services:
       - "--certificatesresolvers.letsencrypt.acme.email=${ACME_EMAIL}"
       - "--certificatesresolvers.letsencrypt.acme.storage=/letsencrypt/acme.json"
       - "--log.level=INFO"
+      - "--entrypoints.siptls.address=:5061"
     ports:
       - "80:80"
       - "443:443"
+      - "5061:5061/tcp"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro
       - traefik_letsencrypt:/letsencrypt
@@ -851,6 +853,34 @@ services:
       - collaboration
     restart: unless-stopped
 
+  # =============================================================================
+  # KAMAILIO - SIP Proxy (Dotty Phone)
+  # =============================================================================
+  # TCP-only Proxy, TLS-Terminierung via Traefik auf Port 5061.
+  # Zwei SIP-Accounts: tobias (Linphone iOS) und dotty (Mac Mini Asterisk).
+  # Siehe: dotty-phone/README.md
+  # =============================================================================
+  kamailio:
+    image: kamailio/kamailio-ci:5.5.2-alpine
+    container_name: kamailio
+    restart: unless-stopped
+    deploy:
+      resources:
+        limits:
+          memory: 64m
+    volumes:
+      - ./kamailio/kamailio.cfg:/etc/kamailio/kamailio.cfg:ro
+      - ./kamailio/kamailio-local.cfg:/etc/kamailio/kamailio-local.cfg:ro
+    networks:
+      - collaboration
+    labels:
+      - "traefik.enable=true"
+      - "traefik.tcp.routers.sip.rule=HostSNI(`sip.toppyr.de`)"
+      - "traefik.tcp.routers.sip.entrypoints=siptls"
+      - "traefik.tcp.routers.sip.tls=true"
+      - "traefik.tcp.routers.sip.tls.certresolver=letsencrypt"
+      - "traefik.tcp.services.sip.loadbalancer.server.port=5060"
+
 volumes:
   gitea_db_data:
   gitea_data:
diff --git a/kamailio/kamailio-local.cfg.example b/kamailio/kamailio-local.cfg.example
new file mode 100644
index 0000000..8329cc9
--- /dev/null
+++ b/kamailio/kamailio-local.cfg.example
@@ -0,0 +1,13 @@
+# =============================================================================
+# Kamailio Credentials
+# =============================================================================
+# HA1-Hashes generieren:
+#   echo -n "username:sip.toppyr.de:PASSWORT" | md5sum | awk '{print $1}'
+#
+# Kopiere diese Datei nach kamailio-local.cfg und trage echte Hashes ein.
+# kamailio-local.cfg wird NICHT ins Git committed!
+# =============================================================================
+
+# Credentials werden in kamailio.cfg request_route geladen:
+# $sht(credentials=>tobias) = "HASH_HIER_EINSETZEN";
+# $sht(credentials=>dotty) = "HASH_HIER_EINSETZEN";
diff --git a/kamailio/kamailio.cfg b/kamailio/kamailio.cfg
new file mode 100644
index 0000000..74d8ec9
--- /dev/null
+++ b/kamailio/kamailio.cfg
@@ -0,0 +1,237 @@
+#!KAMAILIO
+#
+# Dotty Phone — Kamailio SIP Proxy
+# Reiner Signaling-Proxy, kein Media-Handling.
+# Zwei Accounts: tobias (Linphone iOS) und dotty (Mac Mini Asterisk)
+#
+
+####### Global Parameters #######
+
+debug=2
+log_stderror=yes
+fork=yes
+children=2
+auto_aliases=no
+
+# SIP Listen: TCP only (TLS via Traefik Reverse Proxy)
+listen=tcp:0.0.0.0:5060
+
+####### Modules Section #######
+
+loadmodule "kex.so"
+loadmodule "tm.so"
+loadmodule "tmx.so"
+loadmodule "sl.so"
+loadmodule "rr.so"
+loadmodule "pv.so"
+loadmodule "maxfwd.so"
+loadmodule "textops.so"
+loadmodule "siputils.so"
+loadmodule "xlog.so"
+loadmodule "sanity.so"
+loadmodule "usrloc.so"
+loadmodule "registrar.so"
+loadmodule "nathelper.so"
+loadmodule "auth.so"
+loadmodule "htable.so"
+loadmodule "pike.so"
+
+####### Module Parameters #######
+
+# --- User Location (in-memory, kein DB) ---
+modparam("usrloc", "db_mode", 0)
+
+# --- Registrar ---
+modparam("registrar", "default_expires", 120)
+modparam("registrar", "min_expires", 60)
+modparam("registrar", "max_expires", 300)
+
+# --- NAT Helper ---
+modparam("nathelper", "natping_interval", 30)
+modparam("nathelper", "sipping_bflag", 7)
+modparam("nathelper", "sipping_from", "sip:keepalive@sip.toppyr.de")
+modparam("nathelper", "received_avp", "$avp(RECEIVED)")
+
+# --- htable für Credentials ---
+# Format: username => ha1_hash
+# HA1 = MD5(username:sip.toppyr.de:password)
+modparam("htable", "htable", "credentials=>size=4;initval=0;")
+
+# --- Credentials (HA1-Hashes) ---
+# tobias (Linphone iOS): hash von tobias:sip.toppyr.de:8pjd6eskjKmCihsu
+# dotty (Mac Mini): hash von dotty:sip.toppyr.de:XlF11A9eeBDXbWb3
+# Diese werden im request_route geladen (siehe unten)
+
+# --- Pike (Rate Limiting) ---
+modparam("pike", "sampling_time_unit", 2)
+modparam("pike", "reqs_density_per_unit", 30)
+modparam("pike", "remove_latency", 4)
+
+# --- Credentials laden ---
+include_file "kamailio-local.cfg"
+
+####### Routing Logic #######
+
+request_route {
+    # --- Load Credentials on Startup ---
+    if ($sht(credentials=>tobias) == $null) {
+        $sht(credentials=>tobias) = "4190b31a0d1a3fde008eb04104f2dc31";
+        $sht(credentials=>dotty) = "1f044db626dc2f3d6c3865fa20ae130f";
+    }
+
+    # --- Max Forwards ---
+    if (!mf_process_maxfwd_header("10")) {
+        sl_send_reply("483", "Too Many Hops");
+        exit;
+    }
+
+    # --- Sanity Check ---
+    if (!sanity_check("17895", "7")) {
+        xlog("L_WARN", "Malformed SIP from $si:$sp\n");
+        exit;
+    }
+
+    # --- Rate Limiting ---
+    if (!pike_check_req()) {
+        xlog("L_WARN", "Pike blocked $si\n");
+        sl_send_reply("503", "Service Unavailable");
+        exit;
+    }
+
+    # --- NAT Detection ---
+    if (nat_uac_test("19")) {
+        force_rport();
+        if (is_method("REGISTER")) {
+            fix_nated_register();
+        } else {
+            fix_nated_contact();
+        }
+        setbflag(7);
+    }
+
+    # --- REGISTER ---
+    if (is_method("REGISTER")) {
+        route(AUTH);
+        if (!save("location")) {
+            sl_send_reply("500", "Server Error");
+        }
+        exit;
+    }
+
+    # --- Record-Route für Dialoge ---
+    if (is_method("INVITE|SUBSCRIBE")) {
+        record_route();
+    }
+
+    # --- In-Dialog Requests ---
+    if (has_totag()) {
+        if (loose_route()) {
+            if (isbflagset(7)) {
+                add_rr_param(";nat=yes");
+            }
+            route(RELAY);
+            exit;
+        }
+        # ACK ohne Route-Header
+        if (is_method("ACK")) {
+            if (t_check_trans()) {
+                route(RELAY);
+                exit;
+            }
+            exit;
+        }
+        sl_send_reply("404", "Not Found");
+        exit;
+    }
+
+    # --- Authentifizierung für alles außer ACK/CANCEL ---
+    if (is_method("INVITE|MESSAGE|SUBSCRIBE|NOTIFY|OPTIONS")) {
+        route(AUTH);
+    }
+
+    # --- MESSAGE (SIP-Textnachricht) ---
+    if (is_method("MESSAGE")) {
+        if (!lookup("location")) {
+            sl_send_reply("404", "User Not Found");
+            exit;
+        }
+        route(RELAY);
+        exit;
+    }
+
+    # --- INVITE ---
+    if (is_method("INVITE")) {
+        if (!lookup("location")) {
+            # Mac Mini offline
+            sl_send_reply("480", "Temporarily Unavailable");
+            exit;
+        }
+        route(RELAY);
+        exit;
+    }
+
+    # --- CANCEL ---
+    if (is_method("CANCEL")) {
+        if (t_check_trans()) {
+            t_relay();
+        }
+        exit;
+    }
+
+    # --- OPTIONS (Keepalive) ---
+    if (is_method("OPTIONS")) {
+        sl_send_reply("200", "OK");
+        exit;
+    }
+
+    # --- Alles andere ---
+    route(RELAY);
+}
+
+# --- AUTH Route ---
+route[AUTH] {
+    if ($sht(credentials=>$au) == $null) {
+        if (is_method("REGISTER")) {
+            www_challenge("sip.toppyr.de", "0");
+        } else {
+            proxy_challenge("sip.toppyr.de", "0");
+        }
+        exit;
+    }
+    if (is_method("REGISTER")) {
+        if (!pv_www_authenticate("sip.toppyr.de", "$sht(credentials=>$au)", "0")) {
+            www_challenge("sip.toppyr.de", "0");
+            exit;
+        }
+    } else {
+        if (!pv_proxy_authenticate("sip.toppyr.de", "$sht(credentials=>$au)", "0")) {
+            proxy_challenge("sip.toppyr.de", "0");
+            exit;
+        }
+    }
+    consume_credentials();
+}
+
+# --- RELAY Route ---
+route[RELAY] {
+    if (isbflagset(7)) {
+        add_rr_param(";nat=yes");
+    }
+    if (!t_relay()) {
+        sl_send_reply("500", "Relay Error");
+    }
+}
+
+# --- Reply Route (NAT fix für Antworten) ---
+onreply_route {
+    if (nat_uac_test("1")) {
+        fix_nated_contact();
+    }
+}
+
+# --- Failure Route ---
+failure_route[FAIL_ROUTE] {
+    if (t_is_canceled()) {
+        exit;
+    }
+}