diff --git a/services/asterisk_bridge_service/config.py b/services/asterisk_bridge_service/config.py
index aa26fd0..6f44030 100644
--- a/services/asterisk_bridge_service/config.py
+++ b/services/asterisk_bridge_service/config.py
@@ -213,6 +213,16 @@ def ai_voice_queue_config() -> dict[str, dict[str, Any]]:
     return result
 
 
+def _legacy_voice_start_profile(queue_code: str, *, stage: str | None, agent_profile: str) -> tuple[str | None, str]:
+    if stage or agent_profile != "voice_support":
+        return stage, agent_profile
+    # Backward compatibility for deployed IVR AI queues that predate the
+    # explicit voice_start stage/profile fields.
+    if queue_code.startswith("ivr_") and "_ai_" in queue_code:
+        return "voice_start", "voice_start"
+    return stage, agent_profile
+
+
 def ai_voice_config_for_queue(queue_code: str | None) -> dict[str, Any] | None:
     key = str(queue_code or "").strip()
     if not key or not ai_voice_enabled():
@@ -223,6 +233,12 @@ def ai_voice_config_for_queue(queue_code: str | None) -> dict[str, Any] | None:
     if str(item.get("mode") or "ai_first").strip().lower() != "ai_first":
         return None
     stage = str(item.get("stage") or "").strip() or None
+    agent_profile = str(item.get("agent_profile") or "voice_support").strip() or "voice_support"
+    stage, agent_profile = _legacy_voice_start_profile(
+        key,
+        stage=stage,
+        agent_profile=agent_profile,
+    )
     next_queue_code = str(item.get("next_queue_code") or "").strip() or None
     next_queue_id = str(item.get("next_queue_id") or "").strip() or None
     handoff_queue_code = str(item.get("handoff_queue_code") or next_queue_code or key).strip() or key
@@ -234,7 +250,7 @@ def ai_voice_config_for_queue(queue_code: str | None) -> dict[str, Any] | None:
     return {
         "queue_code": key,
         "mode": "ai_first",
-        "agent_profile": str(item.get("agent_profile") or "voice_support").strip() or "voice_support",
+        "agent_profile": agent_profile,
         "language": str(item.get("language") or "").strip() or None,
         "stage": stage,
         "next_queue_code": next_queue_code,
diff --git a/tests/test_asterisk_bridge_service.py b/tests/test_asterisk_bridge_service.py
index 24535b3..802fbd9 100644
--- a/tests/test_asterisk_bridge_service.py
+++ b/tests/test_asterisk_bridge_service.py
@@ -104,6 +104,56 @@ def test_browser_softphone_config_route_returns_403_when_mapping_missing(monkeyp
     assert response.json()["detail"] == "Browser softphone is not configured for this user"
 
 
+def test_ai_voice_config_for_queue_promotes_legacy_ivr_ai_queues_to_voice_start(monkeypatch):
+    monkeypatch.setenv("AI_VOICE_ENABLED", "1")
+    monkeypatch.setenv(
+        "AI_VOICE_QUEUE_CONFIG_JSON",
+        json.dumps(
+            {
+                "ivr_support_ai_ru": {
+                    "mode": "ai_first",
+                    "agent_profile": "voice_support",
+                    "handoff_queue_code": "ivr_support",
+                    "language": "ru",
+                }
+            }
+        ),
+    )
+    monkeypatch.setenv("ASTERISK_QUEUE_MAP_JSON", '{"ivr_support":"que_ivr_support"}')
+
+    config = bridge_module._ai_voice_config_for_queue("ivr_support_ai_ru")
+
+    assert config is not None
+    assert config["agent_profile"] == "voice_start"
+    assert config["stage"] == "voice_start"
+    assert config["handoff_queue_id"] == "que_ivr_support"
+
+
+def test_ai_voice_config_for_queue_preserves_non_ivr_profiles(monkeypatch):
+    monkeypatch.setenv("AI_VOICE_ENABLED", "1")
+    monkeypatch.setenv(
+        "AI_VOICE_QUEUE_CONFIG_JSON",
+        json.dumps(
+            {
+                "voice_lab_ai": {
+                    "mode": "ai_first",
+                    "agent_profile": "voice_support",
+                    "handoff_queue_code": "voice_lab",
+                    "language": "ru",
+                }
+            }
+        ),
+    )
+    monkeypatch.setenv("ASTERISK_QUEUE_MAP_JSON", '{"voice_lab":"que_voice_lab"}')
+
+    config = bridge_module._ai_voice_config_for_queue("voice_lab_ai")
+
+    assert config is not None
+    assert config["agent_profile"] == "voice_support"
+    assert config["stage"] is None
+    assert config["handoff_queue_id"] == "que_voice_lab"
+
+
 def test_post_json_bearer_first_falls_back_to_legacy(monkeypatch):
     class DummyResponse:
         def __init__(self, status_code: int, body: dict):