diff --git a/src/apps/uclient/startuclient.c b/src/apps/uclient/startuclient.c
index 6b0b9c1..afe0b66 100644
--- a/src/apps/uclient/startuclient.c
+++ b/src/apps/uclient/startuclient.c
@@ -419,7 +419,7 @@ static int clnet_allocate(int verbose,
 			int allocate_received = 0;
 			while (!allocate_received) {
 
-				int len = recv_buffer(clnet_info, &response_message, 1, NULL, &request_message);
+				int len = recv_buffer(clnet_info, &response_message, 1, 0, NULL, &request_message);
 
 				if (len > 0) {
 					if (verbose) {
@@ -673,10 +673,10 @@ static int clnet_allocate(int verbose,
 			int refresh_received = 0;
 			while (!refresh_received) {
 
-				int len = recv_buffer(clnet_info, &response_message, 1, 0, &request_message);
+				int len = recv_buffer(clnet_info, &response_message, 1, 0, NULL, &request_message);
 
 				if(clnet_info->s_mobile_id[0]) {
-					len = recv_buffer(clnet_info, &response_message, 1, 0, &request_message);
+					len = recv_buffer(clnet_info, &response_message, 1, 0, NULL, &request_message);
 				}
 
 				if (len > 0) {
@@ -770,7 +770,7 @@ static int turn_channel_bind(int verbose, uint16_t *chn,
 		int cb_received = 0;
 		while (!cb_received) {
 
-			int len = recv_buffer(clnet_info, &response_message, 1, NULL, &request_message);
+			int len = recv_buffer(clnet_info, &response_message, 1, 0, NULL, &request_message);
 			if (len > 0) {
 				if (verbose) {
 					TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO,
@@ -879,7 +879,7 @@ static int turn_create_permission(int verbose, app_ur_conn_info *clnet_info,
 		int cp_received = 0;
 		while (!cp_received) {
 
-			int len = recv_buffer(clnet_info, &response_message, 1, NULL, &request_message);
+			int len = recv_buffer(clnet_info, &response_message, 1, 0, NULL, &request_message);
 			if (len > 0) {
 				if (verbose) {
 					TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO,
@@ -1456,7 +1456,7 @@ static int turn_tcp_connection_bind(int verbose, app_ur_conn_info *clnet_info, a
 		int cb_received = 0;
 		while (!cb_received) {
 
-			int len = recv_buffer(clnet_info, &response_message, 1, atc, &request_message);
+			int len = recv_buffer(clnet_info, &response_message, 1, 1, atc, &request_message);
 			if (len > 0) {
 				if (verbose) {
 					TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO,
diff --git a/src/apps/uclient/uclient.c b/src/apps/uclient/uclient.c
index 6b3010f..1ba6519 100644
--- a/src/apps/uclient/uclient.c
+++ b/src/apps/uclient/uclient.c
@@ -40,6 +40,8 @@
 #include <openssl/err.h>
 #include <openssl/rand.h>
 
+#include <sys/select.h>
+
 static int verbose_packets=0;
 
 static size_t current_clients_number = 0;
@@ -69,6 +71,8 @@ static app_ur_session** elems = NULL;
 
 #define SLEEP_INTERVAL (234)
 
+#define MAX_LISTENING_CYCLE_NUMBER (7)
+
 int RTP_PACKET_INTERVAL = 20;
 
 static inline s64bits time_minus(u64bits t1, u64bits t2) {
@@ -302,7 +306,33 @@ int send_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int data_con
 	return ret;
 }
 
-int recv_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int sync, app_tcp_conn_info *atc, stun_buffer* request_message) {
+static int wait_fd(int fd, unsigned int cycle) {
+
+	fd_set fds;
+	FD_ZERO(&fds);
+	FD_SET(fd,&fds);
+
+	if(dos && cycle==0)
+		return 0;
+
+	struct timeval timeout = {0,0};
+	if(cycle == 0)
+		timeout.tv_usec = 500000;
+	else {
+		timeout.tv_sec = 1;
+		while(--cycle) timeout.tv_sec = timeout.tv_sec + timeout.tv_sec;
+	}
+
+	int rc = 0;
+
+	do {
+		rc = select(fd+1,&fds,NULL,NULL,&timeout);
+	} while((rc<0) && (errno == EINTR));
+
+	return rc;
+}
+
+int recv_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int sync, int data_connection, app_tcp_conn_info *atc, stun_buffer* request_message) {
 
 	int rc = 0;
 
@@ -324,6 +354,22 @@ int recv_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int sync, ap
 
 	recv_again:
 
+	if(!use_tcp && sync && request_message && (fd>=0)) {
+
+		unsigned int cycle = 0;
+		while(cycle < MAX_LISTENING_CYCLE_NUMBER) {
+			int serc = wait_fd(fd,cycle);
+			if(serc>0)
+				break;
+			if(serc<0) {
+				return -1;
+			}
+			if(send_buffer(clnet_info, request_message, data_connection, atc)<=0)
+				return -1;
+			++cycle;
+		}
+	}
+
 	if (!use_secure && !use_tcp && fd >= 0) {
 
 		/* Plain UDP */
@@ -586,7 +632,7 @@ static int client_read(app_ur_session *elem, int is_tcp_data, app_tcp_conn_info
 		TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO, "before read ...\n");
 	}
 
-	rc = recv_buffer(clnet_info, &(elem->in_buffer), 0, atc, NULL);
+	rc = recv_buffer(clnet_info, &(elem->in_buffer), 0, is_tcp_data, atc, NULL);
 
 	if (clnet_verbose && verbose_packets) {
 		TURN_LOG_FUNC(TURN_LOG_LEVEL_INFO, "read %d bytes\n", (int) rc);
@@ -890,13 +936,13 @@ void client_input_handler(evutil_socket_t fd, short what, void* arg) {
     if(elem->pinfo.tcp_conn) {
       int i = 0;
       for(i=0;i<(int)(elem->pinfo.tcp_conn_number);++i) {
-	if(elem->pinfo.tcp_conn[i]) {
-	  if((fd==elem->pinfo.tcp_conn[i]->tcp_data_fd) && (elem->pinfo.tcp_conn[i]->tcp_data_bound)) {
-	    is_tcp_data = 1;
-	    atc = elem->pinfo.tcp_conn[i];
-	    break;
-	  }
-	}
+    	  if(elem->pinfo.tcp_conn[i]) {
+    		  if((fd==elem->pinfo.tcp_conn[i]->tcp_data_fd) && (elem->pinfo.tcp_conn[i]->tcp_data_bound)) {
+    			  is_tcp_data = 1;
+    			  atc = elem->pinfo.tcp_conn[i];
+    			  break;
+    		  }
+    	  }
       }
     }
     int rc = client_read(elem, is_tcp_data, atc);
diff --git a/src/apps/uclient/uclient.h b/src/apps/uclient/uclient.h
index d053afc..43ff021 100644
--- a/src/apps/uclient/uclient.h
+++ b/src/apps/uclient/uclient.h
@@ -99,7 +99,7 @@ void start_mclient(const char *remote_address, int port,
 		   int messagenumber, int mclient);
 
 int send_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int data_connection, app_tcp_conn_info *atc);
-int recv_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int sync, app_tcp_conn_info *atc, stun_buffer* request_message);
+int recv_buffer(app_ur_conn_info *clnet_info, stun_buffer* message, int sync, int data_connection, app_tcp_conn_info *atc, stun_buffer* request_message);
 
 void client_input_handler(evutil_socket_t fd, short what, void* arg);