Fixed bug in simpleua sample: shouldn't respond to ACK request!

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@943 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjsip-apps/src/samples/simpleua.c b/pjsip-apps/src/samples/simpleua.c
index 8c81e7d..0b25521 100644
--- a/pjsip-apps/src/samples/simpleua.c
+++ b/pjsip-apps/src/samples/simpleua.c
@@ -472,11 +472,14 @@
      */
     if (rdata->msg_info.msg->line.req.method.id != PJSIP_INVITE_METHOD) {
 
-	pj_str_t reason = pj_str("Simple UA unable to handle this request");
+	if (rdata->msg_info.msg->line.req.method.id != PJSIP_ACK_METHOD) {
+	    pj_str_t reason = pj_str("Simple UA unable to handle "
+				     "this request");
 
-	pjsip_endpt_respond_stateless( g_endpt, rdata, 
-				       500, &reason,
-				       NULL, NULL);
+	    pjsip_endpt_respond_stateless( g_endpt, rdata, 
+					   500, &reason,
+					   NULL, NULL);
+	}
 	return PJ_TRUE;
     }