Prototpye of a Dockerized Phone Assistant Connecting Fritz!Box with n8n Automation

Freya connects a FRITZ!Box IP phone to Asterisk (PJSIP), handles calls with a Python ARI app, and speaks/recognizes speech locally using Wyoming Piper (TTS) and remote openai (STT).
Designed to trigger/receive data from n8n via a simple webhook.

What this project does

• Registers an IP phone on your FRITZ!Box and accepts inbound calls in Asterisk.
• Runs an ARI app (FastAPI) that answers, bridges audio, and can TTS/STT.
• Uses Wyoming Piper for fast, local TTS (and optional local STT).
• Provides a tiny Dialer API (POST /call) to place an outbound call and speak a message.
• Plays nicely with n8n via Webhook → Webhook Respond.

Requirements

• A FRITZ!Box in your LAN (e.g., 192.168.178.1), with an IP phone (username/password) created.
• Linux host with Docker & Docker Compose.
• OPENAI_API_KEY on the host

📞 FRITZ!Box: New IP Phone Configuration

1. Open FRITZ!Box Web Interface
   Go to http://fritz.box or http://192.168.178.1.

2. Navigate to Telephony → Telephone Devices
   Click “New Device” → choose “Telephone (with LAN/WLAN)” → click Next.

3. Select “IP Telephone”
   Give it a name, e.g. freya.

4. Create credentials

   • Username: freya
   • Password: (choose a strong password, you’ll use it in pjsip.conf)
   • Allow registration from the home network: ✅
   • Optionally allow from internet if Asterisk runs remotely.

5. Finish setup

   • The FRITZ!Box shows:
     • Username: freya
     • Registrar: fritz.box or 192.168.178.1
   • Note these values for your Asterisk config.

6. Test registration
   After starting your Docker container, open Asterisk CLI:

   docker exec -it fritz-voice-assistant asterisk -rvvv
   pjsip show registrations
   

   You should see Registered next to your fritz endpoint.

Minimal project layout (only what you need)

.
├── config/                    # Asterisk & app configs (mounts into the container)
│   ├── pjsip.conf.template    # <- rename to pjsip.conf and set FRITZ user/password/IP
│   ├── pjsip.conf             # (your file after renaming; do NOT commit secrets)
│   ├── extensions.conf        # dialplan: routes inbound to ARI
│   ├── http.conf              # enables Asterisk HTTP/WS (for ARI)
│   ├── ari.conf               # ARI credentials
│   ├── rtp.conf               # RTP port range
│   ├── asterisk.conf          # base Asterisk config
│   └── freya.yaml             # app settings (TTS/STT, webhook URL, etc.)
├── docker/                    
│   └── supervisord.conf       # starts Asterisk and ARI apps
├── Dockerfile                 # builds Asterisk + Python venv image
└── docker-compose.yml         # runs Asterisk/ARI and Wyoming Piper

Edit only: config/pjsip.conf (renamed from the provided template) to set <FRITZ_USER>, <FRITZ_PASS>, <FRITZ_IP>.

Quick install (Ubuntu)

https://docs.docker.com/engine/install/ubuntu/

Prepare config

# in your project root
cp config/pjsip.conf.template config/pjsip.conf
# open config/pjsip.conf and replace placeholders:
#   <FRITZ_USER>, <FRITZ_PASS>, <FRITZ_IP> (e.g., 192.168.178.1)

Optional for examples:

export OPENAI_API_KEY=sk-...    # on your host shell (not required for core call handling)

Docker Compose (copy/paste ready)

services:
  fritz-voice-assistant:
    build:
      context: .
      dockerfile: Dockerfile
    image: fritz-voice-assistant:latest
    network_mode: "host"                     # SIP/RTP friendly (no NAT hassle)
    restart: unless-stopped
    environment:
      - OPENAI_API_KEY                       # passed through from host if set
    volumes:
      - ./config/asterisk.conf:/etc/asterisk/asterisk.conf:ro
      - ./config/pjsip.conf:/etc/asterisk/pjsip.conf:ro
      - ./config/extensions.conf:/etc/asterisk/extensions.conf:ro
      - ./config/rtp.conf:/etc/asterisk/rtp.conf:ro
      - ./config/http.conf:/etc/asterisk/http.conf:ro
      - ./config/ari.conf:/etc/asterisk/ari.conf:ro
      - ./config/freya.yaml:/opt/freya/phone/freya.yaml:ro  # app config

  wyoming-piper:
    image: rhasspy/wyoming-piper:latest
    container_name: wyoming-piper
    restart: unless-stopped
    ports:
      - "10200:10200"
    volumes:
      - /home/andi/docker-volumes/wyoming-piper:/data     # adjust path if needed
    command: --voice de_DE-ramona-low --update

Start it:

docker compose up -d --build

Test the Dialer API (outbound)

curl -sS -X POST http://127.0.0.1:8099/call   -H 'Content-Type: application/json'   -d '{"callerId":"<TARGET_NUMBER>","message":"Hello from Freya! This is a test."}'

Inbound: call your FRITZ!Box number and watch Asterisk logs.

n8n (optional, very short)

Quick run:

docker run -d --name n8n -p 5678:5678 n8nio/n8n

In n8n:

• Add a Webhook (Trigger) node (POST), copy its URL.
• Add HTTP Request node calling http://localhost:8099/call with JSON body:

  { "callerId": "0176...", "message": "Your dynamic text here" }
  

• Add a Webhook Respond node if you want to return data immediately.

Troubleshooting (Asterisk essentials)

Enter the Asterisk CLI inside the container

docker exec -it fritz-voice-assistant asterisk -rvvvv

Reload and inspect PJSIP

pjsip reload
pjsip show registrations
pjsip show endpoints
pjsip show endpoint fritz-endpoint

SIP message trace / RTP trace

pjsip set logger on
rtp set debug on

Typical fixes

• 401 Unauthorized on register → check <FRITZ_USER>/<FRITZ_PASS>/<FRITZ_IP> in config/pjsip.conf, confirm IP phone is enabled in FRITZ!Box.
• No audio → ensure Answer() before Stasis() in extensions.conf; endpoint has allow=alaw,ulaw; check rtp set debug on shows “Got/Sent RTP”.
• Dialer 500 “Allocation failed” → use a valid endpoint and/or AOR contact (e.g., contact=sip:<FRITZ_IP>:5060 in AOR, or dial PJSIP/fritz-endpoint/sip:{number}@<FRITZ_IP>).

Exit CLI

exit

License

Open Source (MIT).

About

Built to connect a FRITZ!Box with n8n via Asterisk ARI – with fast, local TTS using Piper.
Created by Andreas (Hobby Developer).