docs: Update document pages for v0.5.0 release (#2019)

Author: seratch

docs/realtime/guide.md

@@ -156,6 +156,35 @@ Send audio to the session using [`session.send_audio(audio_bytes)`][agents.realt
 
 For audio output, listen for `audio` events and play the audio data through your preferred audio library. Make sure to listen for `audio_interrupted` events to stop playback immediately and clear any queued audio when the user interrupts the agent.
 
+## SIP integration
+
+You can attach realtime agents to phone calls that arrive via the [Realtime Calls API](https://platform.openai.com/docs/guides/realtime-sip). The SDK provides [`OpenAIRealtimeSIPModel`][agents.realtime.openai_realtime.OpenAIRealtimeSIPModel], which reuses the same agent flow while negotiating media over SIP.
+
+To use it, pass the model instance to the runner and supply the SIP `call_id` when starting the session. The call ID is delivered by the webhook that signals an incoming call.
+
+```python
+from agents.realtime import RealtimeAgent, RealtimeRunner
+from agents.realtime.openai_realtime import OpenAIRealtimeSIPModel
+
+runner = RealtimeRunner(
+    starting_agent=agent,
+    model=OpenAIRealtimeSIPModel(),
+)
+
+async with await runner.run(
+    model_config={
+        "call_id": call_id_from_webhook,
+        "initial_model_settings": {
+            "turn_detection": {"type": "semantic_vad", "interrupt_response": True},
+        },
+    },
+) as session:
+    async for event in session:
+        ...
+```
+
+When the caller hangs up, the SIP session ends and the realtime connection closes automatically. For a complete telephony example, see [`examples/realtime/twilio_sip`](https://github.com/openai/openai-agents-python/tree/main/examples/realtime/twilio_sip).
+
 ## Direct model access
 
 You can access the underlying model to add custom listeners or perform advanced operations:

docs/release.md

@@ -19,6 +19,13 @@ We will increment `Z` for non-breaking changes:
 
 ## Breaking change changelog
 
+### 0.5.0
+
+This version doesn’t introduce any visible breaking changes, but it includes new features and a few significant updates under the hood:
+
+- Added support for `RealtimeRunner` to handle [SIP protocol connections](https://platform.openai.com/docs/guides/realtime-sip)
+- Significantly revised the internal logic of `Runner#run_sync` for Python 3.14 compatibility
+
 ### 0.4.0
 
 In this version, [openai](https://pypi.org/project/openai/) package v1.x versions are no longer supported. Please use openai v2.x along with this SDK.