diff --git a/backend/services/pipecat/transports.py b/backend/services/pipecat/transports.py
index 6f789ec..c7e8037 100644
--- a/backend/services/pipecat/transports.py
+++ b/backend/services/pipecat/transports.py
@@ -29,6 +29,9 @@ def _base_params() -> dict:
     return dict(
         audio_in_enabled=True,
         audio_out_enabled=True,
+        # EndFrame 后默认补 2s 静音(防止收尾被截断)。我们的挂断已等到机器人
+        # 说完才触发,这段静音纯属空等,置 0 让结束语播完立即挂断。
+        audio_out_end_silence_secs=0,
     )