Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 182208)
+++ channels/chan_sip.c	(working copy)
@@ -2940,6 +2940,9 @@
 		dialog->packets = dialog->packets->next;
 		AST_SCHED_DEL(sched, cp->retransid);
 		dialog_unref(cp->owner, "remove all current packets in this dialog, and the pointer to the dialog too as part of __sip_destroy");
+		if (cp->data) {
+			ast_free(cp->data);
+		}
 		ast_free(cp);
 	}