diff --git a/changelog/3571.added.2.md b/changelog/3571.added.2.md
new file mode 100644
index 000000000..f9af8dde0
--- /dev/null
+++ b/changelog/3571.added.2.md
@@ -0,0 +1 @@
+- Added `function_call_timeout_secs` parameter to `LLMService` to configure timeout for deferred function calls (defaults to 10.0 seconds).
diff --git a/changelog/3571.added.md b/changelog/3571.added.md
new file mode 100644
index 000000000..927bbcbc4
--- /dev/null
+++ b/changelog/3571.added.md
@@ -0,0 +1 @@
+- Added `result_callback` parameter to `UserImageRequestFrame` to support deferred function call results.
diff --git a/changelog/3571.changed.md b/changelog/3571.changed.md
new file mode 100644
index 000000000..eb44cae0a
--- /dev/null
+++ b/changelog/3571.changed.md
@@ -0,0 +1,4 @@
+- ⚠️ Changed function call handling to use timeout-based completion instead of immediate callback execution.
+  - Function calls that defer their results (e.g., `UserImageRequestFrame`) now use a timeout mechanism
+  - The `result_callback` is invoked automatically when the deferred operation completes or after timeout
+  - This change affects examples using `UserImageRequestFrame` - the `result_callback` should now be passed to the frame instead of being called immediately