diff --git a/Unreal/PS_AI_Agent/Config/DefaultEngine.ini b/Unreal/PS_AI_Agent/Config/DefaultEngine.ini
index 4e40f5b..6bf2861 100644
--- a/Unreal/PS_AI_Agent/Config/DefaultEngine.ini
+++ b/Unreal/PS_AI_Agent/Config/DefaultEngine.ini
@@ -166,6 +166,14 @@ DefaultPlatformService=Null
 [OnlineSubsystemNull]
 bEnabled=true
 
+[Voice]
+; Enable the Voice module so FVoiceModule::CreateVoiceEncoder() returns a valid
+; Opus encoder/decoder. The engine default is bEnabled=false, which leaves the
+; encoder NULL and makes networked agent audio fall back to raw PCM in large
+; reliable multicast RPCs — these overflow the reliable buffer and drop VR
+; client connections the moment the avatar speaks. With Opus, chunks are ~1-4KB.
+bEnabled=true
+
 [/Script/AndroidFileServerEditor.AndroidFileServerRuntimeSettings]
 bEnablePlugin=True
 bAllowNetworkConnection=True