first commit

backend/app/voice/relay_config.py

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+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from ..models import PhoneNumber, VoiceSocketEndpoint
+
+
+def resolve_voice_socket(
+    db: Session,
+    *,
+    phone_number: PhoneNumber,
+) -> VoiceSocketEndpoint | None:
+    return db.scalar(
+        select(VoiceSocketEndpoint).where(
+            VoiceSocketEndpoint.phone_number_id == phone_number.id,
+            VoiceSocketEndpoint.user_id == phone_number.user_id,
+            VoiceSocketEndpoint.enabled.is_(True),
+        )
+    )