diff --git a/core/AmSipDialog.cpp b/core/AmSipDialog.cpp
index 304b7b8b..79808d50 100644
--- a/core/AmSipDialog.cpp
+++ b/core/AmSipDialog.cpp
@@ -701,5 +701,7 @@ int AmSipDialog::send_200_ack(const AmSipTransaction& t,
   if (SipCtrlInterface::send(req))
     return -1;
 
+  uas_trans.remove(t.cseq);
+
   return 0;
 }