Add call transfer response option

fern/server-url/events.mdx

@@ -146,6 +146,40 @@ Respond with either an existing assistant ID, a transient assistant, or transfer
 { "destination": { "type": "number", "phoneNumber": "+11234567890" } }
 ```
 
+#### Transfer only (skip AI)
+
+If you want to immediately transfer the call without using an assistant, return a `destination` in your `assistant-request` response. This bypasses AI handling.
+
+```json
+{
+  "destination": {
+    "type": "number",
+    "phoneNumber": "+14155552671",
+    "callerId": "{{phoneNumber.number}}",
+    "extension": "101",
+    "message": "Connecting you to support."
+  }
+}
+```
+
+```json
+{
+  "destination": {
+    "type": "sip",
+    "sipUri": "sip:[email protected]",
+    "sipHeaders": { "X-Account": "gold" },
+    "message": "Transferring you now."
+  }
+}
+```
+
+<Note>
+  When `destination` is present in the `assistant-request` response, the call forwards immediately and <code>assistantId</code>, <code>assistant</code>, <code>squadId</code>, and <code>squad</code> are ignored.
+  You must still respond within <strong>7.5 seconds</strong>.
+  To transfer silently, set <code>destination.message</code> to an empty string.
+  For caller ID behavior, see <a href="/calls/call-features">Call features</a>.
+ </Note>
+
 Or return an error message to be spoken to the caller:
 
 ```json