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backend/app/voice/public_url.py

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+import json
+import logging
+import urllib.error
+import urllib.request
+
+from ..config import settings
+
+logger = logging.getLogger(__name__)
+
+
+def get_ngrok_wss_base() -> str | None:
+    """Detect ngrok public WSS base (test_bonvoice/outbound_call.py pattern)."""
+    tunnel_hosts = ("127.0.0.1:4040", "host.docker.internal:4040")
+    for host in tunnel_hosts:
+        try:
+            with urllib.request.urlopen(f"http://{host}/api/tunnels", timeout=2) as resp:
+                data = json.load(resp)
+            for tunnel in data.get("tunnels", []):
+                public = tunnel.get("public_url", "")
+                if public.startswith("https://"):
+                    ngrok_host = public.removeprefix("https://")
+                    return f"wss://{ngrok_host}/api/v1/voice"
+        except (urllib.error.URLError, TimeoutError, json.JSONDecodeError, OSError):
+            continue
+    return None
+
+
+def resolve_voice_relay_public_base() -> str:
+    configured = settings.voice_relay_public_url.rstrip("/")
+    if "localhost" in configured or "127.0.0.1" in configured:
+        ngrok_base = get_ngrok_wss_base()
+        if ngrok_base:
+            logger.info("Using ngrok voice relay base: %s", ngrok_base)
+            return ngrok_base
+    return configured
+
+
+def unified_voicebot_url() -> str:
+    """Bonvoice outbound media URL (voicebotURL)."""
+    return f"{resolve_voice_relay_public_base()}/ws/media"