Index: uspace/srv/net/tl/icmp/icmp.c
===================================================================
--- uspace/srv/net/tl/icmp/icmp.c	(revision bf1728257878be61830ed8a583f39ba76e6d3b18)
+++ uspace/srv/net/tl/icmp/icmp.c	(revision b366a6f4b86cb7fe82fcf415965c5a7de1a59638)
@@ -118,6 +118,6 @@
 
 /** Global data */
-static int phone_net = -1;
-static int phone_ip = -1;
+static async_sess_t *net_sess = NULL;
+static async_sess_t *ip_sess = NULL;
 static bool error_reporting = true;
 static bool echo_replying = true;
@@ -173,5 +173,5 @@
 static void icmp_release(packet_t *packet)
 {
-	pq_release_remote(phone_net, packet_get_id(packet));
+	pq_release_remote(net_sess, packet_get_id(packet));
 }
 
@@ -225,5 +225,5 @@
 	}
 	
-	return ip_send_msg(phone_ip, -1, packet, SERVICE_ICMP, error);
+	return ip_send_msg(ip_sess, -1, packet, SERVICE_ICMP, error);
 }
 
@@ -297,5 +297,5 @@
 	size_t length = (size_t) addrlen;
 	
-	packet_t *packet = packet_get_4_remote(phone_net, size,
+	packet_t *packet = packet_get_4_remote(net_sess, size,
 	    icmp_dimension.addr_len, ICMP_HEADER_SIZE + icmp_dimension.prefix,
 	    icmp_dimension.suffix);
@@ -595,5 +595,5 @@
 	case ICMP_SKIP:
 	case ICMP_PHOTURIS:
-		ip_received_error_msg(phone_ip, -1, packet,
+		ip_received_error_msg(ip_sess, -1, packet,
 		    SERVICE_IP, SERVICE_ICMP);
 		return EOK;
@@ -609,4 +609,5 @@
  * @param[in,out] icall Message parameters.
  * @param[in]     arg   Local argument.
+ *
  */
 static void icmp_receiver(ipc_callid_t iid, ipc_call_t *icall, void *arg)
@@ -621,5 +622,5 @@
 		switch (IPC_GET_IMETHOD(*icall)) {
 		case NET_TL_RECEIVED:
-			rc = packet_translate_remote(phone_net, &packet,
+			rc = packet_translate_remote(net_sess, &packet,
 			    IPC_GET_PACKET(*icall));
 			if (rc == EOK) {
@@ -641,5 +642,5 @@
 /** Initialize the ICMP module.
  *
- * @param[in] net_phone Network module phone.
+ * @param[in] sess Network module session.
  *
  * @return EOK on success.
@@ -647,5 +648,5 @@
  *
  */
-int tl_initialize(int net_phone)
+int tl_initialize(async_sess_t *sess)
 {
 	measured_string_t names[] = {
@@ -669,11 +670,11 @@
 	atomic_set(&icmp_client, 0);
 	
-	phone_net = net_phone;
-	phone_ip = ip_bind_service(SERVICE_IP, IPPROTO_ICMP, SERVICE_ICMP,
+	net_sess = sess;
+	ip_sess = ip_bind_service(SERVICE_IP, IPPROTO_ICMP, SERVICE_ICMP,
 	    icmp_receiver);
-	if (phone_ip < 0)
-		return phone_ip;
-	
-	int rc = ip_packet_size_req(phone_ip, -1, &icmp_dimension);
+	if (ip_sess == NULL)
+		return ENOENT;
+	
+	int rc = ip_packet_size_req(ip_sess, -1, &icmp_dimension);
 	if (rc != EOK)
 		return rc;
@@ -684,5 +685,5 @@
 	/* Get configuration */
 	configuration = &names[0];
-	rc = net_get_conf_req(phone_net, &configuration, count, &data);
+	rc = net_get_conf_req(net_sess, &configuration, count, &data);
 	if (rc != EOK)
 		return rc;
@@ -762,5 +763,5 @@
 	
 	case NET_ICMP_DEST_UNREACH:
-		rc = packet_translate_remote(phone_net, &packet,
+		rc = packet_translate_remote(net_sess, &packet,
 		    IPC_GET_PACKET(*call));
 		if (rc != EOK)
@@ -771,5 +772,5 @@
 	
 	case NET_ICMP_SOURCE_QUENCH:
-		rc = packet_translate_remote(phone_net, &packet,
+		rc = packet_translate_remote(net_sess, &packet,
 		    IPC_GET_PACKET(*call));
 		if (rc != EOK)
@@ -779,5 +780,5 @@
 	
 	case NET_ICMP_TIME_EXCEEDED:
-		rc = packet_translate_remote(phone_net, &packet,
+		rc = packet_translate_remote(net_sess, &packet,
 		    IPC_GET_PACKET(*call));
 		if (rc != EOK)
@@ -787,5 +788,5 @@
 	
 	case NET_ICMP_PARAMETERPROB:
-		rc = packet_translate_remote(phone_net, &packet,
+		rc = packet_translate_remote(net_sess, &packet,
 		    IPC_GET_PACKET(*call));
 		if (rc != EOK)
Index: uspace/srv/net/tl/tcp/tcp.c
===================================================================
--- uspace/srv/net/tl/tcp/tcp.c	(revision bf1728257878be61830ed8a583f39ba76e6d3b18)
+++ uspace/srv/net/tl/tcp/tcp.c	(revision b366a6f4b86cb7fe82fcf415965c5a7de1a59638)
@@ -38,5 +38,4 @@
 #include <assert.h>
 #include <async.h>
-#include <async_obsolete.h>
 #include <fibril_synch.h>
 #include <malloc.h>
@@ -74,7 +73,4 @@
 #include "tcp_header.h"
 
-// FIXME: remove this header
-#include <kernel/ipc/ipc_methods.h>
-
 /** TCP module name. */
 #define NAME  "tcp"
@@ -210,5 +206,6 @@
 
 static int tcp_received_msg(device_id_t, packet_t *, services_t, services_t);
-static int tcp_process_client_messages(ipc_callid_t, ipc_call_t);
+static int tcp_process_client_messages(async_sess_t *, ipc_callid_t,
+    ipc_call_t);
 
 static int tcp_listen_message(socket_cores_t *, int, int);
@@ -328,7 +325,7 @@
 
 	if (!socket) {
-		if (tl_prepare_icmp_packet(tcp_globals.net_phone,
-		    tcp_globals.icmp_phone, packet, error) == EOK) {
-			icmp_destination_unreachable_msg(tcp_globals.icmp_phone,
+		if (tl_prepare_icmp_packet(tcp_globals.net_sess,
+		    tcp_globals.icmp_sess, packet, error) == EOK) {
+			icmp_destination_unreachable_msg(tcp_globals.icmp_sess,
 			    ICMP_PORT_UNREACH, 0, packet);
 		}
@@ -401,9 +398,9 @@
 		fibril_rwlock_write_unlock(socket_data->local_lock);
 
-		rc = tl_prepare_icmp_packet(tcp_globals.net_phone,
-		    tcp_globals.icmp_phone, packet, error);
+		rc = tl_prepare_icmp_packet(tcp_globals.net_sess,
+		    tcp_globals.icmp_sess, packet, error);
 		if (rc == EOK) {
 			/* Checksum error ICMP */
-			icmp_parameter_problem_msg(tcp_globals.icmp_phone,
+			icmp_parameter_problem_msg(tcp_globals.icmp_sess,
 			    ICMP_PARAM_POINTER,
 			    ((size_t) ((void *) &header->checksum)) -
@@ -443,5 +440,5 @@
 		break;
 	default:
-		pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+		pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 	}
 
@@ -506,5 +503,5 @@
 			/* Release the acknowledged packets */
 			next_packet = pq_next(packet);
-			pq_release_remote(tcp_globals.net_phone,
+			pq_release_remote(tcp_globals.net_sess,
 			    packet_get_id(packet));
 			packet = next_packet;
@@ -565,5 +562,5 @@
 			next_packet = pq_next(next_packet);
 			pq_insert_after(tmp_packet, next_packet);
-			pq_release_remote(tcp_globals.net_phone,
+			pq_release_remote(tcp_globals.net_sess,
 			    packet_get_id(tmp_packet));
 		}
@@ -602,5 +599,5 @@
 				if (packet == socket_data->incoming)
 					socket_data->incoming = next_packet;
-				pq_release_remote(tcp_globals.net_phone,
+				pq_release_remote(tcp_globals.net_sess,
 				    packet_get_id(packet));
 				packet = next_packet;
@@ -625,5 +622,5 @@
 				if (length <= 0) {
 					/* Remove the empty packet */
-					pq_release_remote(tcp_globals.net_phone,
+					pq_release_remote(tcp_globals.net_sess,
 					    packet_get_id(packet));
 					packet = next_packet;
@@ -672,5 +669,5 @@
 				}
 				/* Remove the duplicit or corrupted packet */
-				pq_release_remote(tcp_globals.net_phone,
+				pq_release_remote(tcp_globals.net_sess,
 				    packet_get_id(packet));
 				packet = next_packet;
@@ -699,7 +696,7 @@
 		if (rc != EOK) {
 			/* Remove the corrupted packets */
-			pq_release_remote(tcp_globals.net_phone,
+			pq_release_remote(tcp_globals.net_sess,
 			    packet_get_id(packet));
-			pq_release_remote(tcp_globals.net_phone,
+			pq_release_remote(tcp_globals.net_sess,
 			    packet_get_id(next_packet));
 		} else {
@@ -712,10 +709,10 @@
 				    new_sequence_number, length);
 				if (rc != EOK) {
-					pq_release_remote(tcp_globals.net_phone,
+					pq_release_remote(tcp_globals.net_sess,
 					    packet_get_id(next_packet));
 				}
 				rc = pq_insert_after(packet, next_packet);
 				if (rc != EOK) {
-					pq_release_remote(tcp_globals.net_phone,
+					pq_release_remote(tcp_globals.net_sess,
 					    packet_get_id(next_packet));
 				}
@@ -726,5 +723,5 @@
 		printf("unexpected\n");
 		/* Release duplicite or restricted */
-		pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+		pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 		forced_ack = true;
 	}
@@ -794,5 +791,5 @@
 	if (rc != EOK)
 		return tcp_release_and_return(packet, rc);
-	rc = tl_get_ip_packet_dimension(tcp_globals.ip_phone,
+	rc = tl_get_ip_packet_dimension(tcp_globals.ip_sess,
 	    &tcp_globals.dimensions, socket_data->device_id, &packet_dimension);
 	if (rc != EOK)
@@ -803,9 +800,10 @@
 
 	/* Notify the destination socket */
-	async_obsolete_msg_5(socket->phone, NET_SOCKET_RECEIVED,
-	    (sysarg_t) socket->socket_id,
+	async_exch_t *exch = async_exchange_begin(socket->sess);
+	async_msg_5(exch, NET_SOCKET_RECEIVED, (sysarg_t) socket->socket_id,
 	    ((packet_dimension->content < socket_data->data_fragment_size) ?
 	    packet_dimension->content : socket_data->data_fragment_size), 0, 0,
 	    (sysarg_t) fragments);
+	async_exchange_end(exch);
 
 	return EOK;
@@ -824,8 +822,8 @@
 
 	/* Notify the destination socket */
-	async_obsolete_msg_5(socket->phone, NET_SOCKET_RECEIVED,
-	    (sysarg_t) socket->socket_id,
-	    0, 0, 0,
-	    (sysarg_t) 0 /* 0 fragments == no more data */);
+	async_exch_t *exch = async_exchange_begin(socket->sess);
+	async_msg_5(exch, NET_SOCKET_RECEIVED, (sysarg_t) socket->socket_id,
+	    0, 0, 0, (sysarg_t) 0 /* 0 fragments == no more data */);
+	async_exchange_end(exch);
 }
 
@@ -853,5 +851,5 @@
 	next_packet = pq_detach(packet);
 	if (next_packet) {
-		pq_release_remote(tcp_globals.net_phone,
+		pq_release_remote(tcp_globals.net_sess,
 		    packet_get_id(next_packet));
 	}
@@ -940,5 +938,5 @@
 	/* Create a socket */
 	socket_id = -1;
-	rc = socket_create(socket_data->local_sockets, listening_socket->phone,
+	rc = socket_create(socket_data->local_sockets, listening_socket->sess,
 	    socket_data, &socket_id);
 	if (rc != EOK) {
@@ -993,5 +991,5 @@
 	fibril_rwlock_write_unlock(&tcp_globals.lock);
 	if (rc != EOK) {
-		socket_destroy(tcp_globals.net_phone, socket->socket_id,
+		socket_destroy(tcp_globals.net_sess, socket->socket_id,
 		    socket_data->local_sockets, &tcp_globals.sockets,
 		    tcp_free_socket_data);
@@ -1005,5 +1003,5 @@
 	next_packet = pq_detach(packet);
 	if (next_packet) {
-		pq_release_remote(tcp_globals.net_phone,
+		pq_release_remote(tcp_globals.net_sess,
 		    packet_get_id(next_packet));
 	}
@@ -1014,5 +1012,5 @@
 		    packet_get_data_length(packet) - sizeof(*header));
 		if (rc != EOK) {
-			socket_destroy(tcp_globals.net_phone, socket->socket_id,
+			socket_destroy(tcp_globals.net_sess, socket->socket_id,
 			    socket_data->local_sockets, &tcp_globals.sockets,
 			    tcp_free_socket_data);
@@ -1025,5 +1023,5 @@
 	rc = tcp_queue_packet(socket, socket_data, packet, 1);
 	if (rc != EOK) {
-		socket_destroy(tcp_globals.net_phone, socket->socket_id,
+		socket_destroy(tcp_globals.net_sess, socket->socket_id,
 		    socket_data->local_sockets, &tcp_globals.sockets,
 		    tcp_free_socket_data);
@@ -1033,5 +1031,5 @@
 	packet = tcp_get_packets_to_send(socket, socket_data);
 	if (!packet) {
-		socket_destroy(tcp_globals.net_phone, socket->socket_id,
+		socket_destroy(tcp_globals.net_sess, socket->socket_id,
 		    socket_data->local_sockets, &tcp_globals.sockets,
 		    tcp_free_socket_data);
@@ -1068,5 +1066,5 @@
 
 	socket_data->next_incoming = ntohl(header->sequence_number); /* + 1; */
-	pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+	pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 	socket_data->state = TCP_SOCKET_ESTABLISHED;
 	listening_socket = socket_cores_find(socket_data->local_sockets,
@@ -1082,8 +1080,10 @@
 		if (rc == EOK) {
 			/* Notify the destination socket */
-			async_obsolete_msg_5(socket->phone, NET_SOCKET_ACCEPTED,
+			async_exch_t *exch = async_exchange_begin(socket->sess);
+			async_msg_5(exch, NET_SOCKET_ACCEPTED,
 			    (sysarg_t) listening_socket->socket_id,
 			    socket_data->data_fragment_size, TCP_HEADER_SIZE,
 			    0, (sysarg_t) socket->socket_id);
+			async_exchange_end(exch);
 
 			fibril_rwlock_write_unlock(socket_data->local_lock);
@@ -1181,5 +1181,5 @@
 				/* Add to acknowledged or release */
 				if (pq_add(&acknowledged, packet, 0, 0) != EOK)
-					pq_release_remote(tcp_globals.net_phone,
+					pq_release_remote(tcp_globals.net_sess,
 					    packet_get_id(packet));
 				packet = next;
@@ -1190,5 +1190,5 @@
 		/* Release acknowledged */
 		if (acknowledged) {
-			pq_release_remote(tcp_globals.net_phone,
+			pq_release_remote(tcp_globals.net_sess,
 			    packet_get_id(acknowledged));
 		}
@@ -1234,11 +1234,12 @@
 	assert(answer);
 	assert(answer_count);
-
+	
 	*answer_count = 0;
-	switch (IPC_GET_IMETHOD(*call)) {
-	case IPC_M_CONNECT_TO_ME:
-		return tcp_process_client_messages(callid, *call);
-	}
-
+	
+	async_sess_t *callback =
+	    async_callback_receive_start(EXCHANGE_SERIALIZE, call);
+	if (callback)
+		return tcp_process_client_messages(callback, callid, *call);
+	
 	return ENOTSUP;
 }
@@ -1270,9 +1271,9 @@
 }
 
-int tcp_process_client_messages(ipc_callid_t callid, ipc_call_t call)
+int tcp_process_client_messages(async_sess_t *sess, ipc_callid_t callid,
+    ipc_call_t call)
 {
 	int res;
 	socket_cores_t local_sockets;
-	int app_phone = IPC_GET_PHONE(call);
 	struct sockaddr *addr;
 	int socket_id;
@@ -1325,5 +1326,5 @@
 			fibril_rwlock_write_lock(&lock);
 			socket_id = SOCKET_GET_SOCKET_ID(call);
-			res = socket_create(&local_sockets, app_phone,
+			res = socket_create(&local_sockets, sess,
 			    socket_data, &socket_id);
 			SOCKET_SET_SOCKET_ID(answer, socket_id);
@@ -1333,5 +1334,5 @@
 				break;
 			}
-			if (tl_get_ip_packet_dimension(tcp_globals.ip_phone,
+			if (tl_get_ip_packet_dimension(tcp_globals.ip_sess,
 			    &tcp_globals.dimensions, DEVICE_INVALID_ID,
 			    &packet_dimension) == EOK) {
@@ -1508,10 +1509,10 @@
 	}
 
-	/* Release the application phone */
-	async_obsolete_hangup(app_phone);
+	/* Release the application session */
+	async_hangup(sess);
 
 	printf("release\n");
 	/* Release all local sockets */
-	socket_cores_release(tcp_globals.net_phone, &local_sockets,
+	socket_cores_release(tcp_globals.net_sess, &local_sockets,
 	    &tcp_globals.sockets, tcp_free_socket_data);
 
@@ -1621,5 +1622,5 @@
 			local_lock = socket_data->local_lock;
 			fibril_rwlock_write_lock(local_lock);
-			socket_destroy(tcp_globals.net_phone,
+			socket_destroy(tcp_globals.net_sess,
 			    timeout->socket_id, timeout->local_sockets,
 			    &tcp_globals.sockets, tcp_free_socket_data);
@@ -1754,5 +1755,5 @@
 	}
 
-	rc = ip_get_route_req(tcp_globals.ip_phone, IPPROTO_TCP,
+	rc = ip_get_route_req(tcp_globals.ip_sess, IPPROTO_TCP,
 	    addr, addrlen, &socket_data->device_id,
 	    &socket_data->pseudo_header, &socket_data->headerlen);
@@ -1902,5 +1903,5 @@
 			rc = pq_insert_after(previous, copy);
 			if (rc != EOK) {
-				pq_release_remote(tcp_globals.net_phone,
+				pq_release_remote(tcp_globals.net_sess,
 				    packet_get_id(copy));
 				return sending;
@@ -1939,5 +1940,5 @@
 	    socket_data->headerlen, packet_get_data_length(packet));
 	if (rc != EOK) {
-		pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+		pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 		return NULL;
 	}
@@ -1946,5 +1947,5 @@
 	header = (tcp_header_t *) packet_get_data(packet);
 	if (!header) {
-		pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+		pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 		return NULL;
 	}
@@ -1971,5 +1972,5 @@
 	rc = ip_client_prepare_packet(packet, IPPROTO_TCP, 0, 0, 0, 0);
 	if (rc != EOK) {
-		pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+		pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 		return NULL;
 	}
@@ -1978,5 +1979,5 @@
 	    sequence_number, socket_data->state, socket_data->timeout, true);
 	if (rc != EOK) {
-		pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+		pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 		return NULL;
 	}
@@ -1995,5 +1996,5 @@
 
 	/* Make a copy of the packet */
-	copy = packet_get_copy(tcp_globals.net_phone, packet);
+	copy = packet_get_copy(tcp_globals.net_sess, packet);
 	if (!copy)
 		return NULL;
@@ -2009,5 +2010,5 @@
 	while (packet) {
 		next = pq_detach(packet);
-		ip_send_msg(tcp_globals.ip_phone, device_id, packet,
+		ip_send_msg(tcp_globals.ip_sess, device_id, packet,
 		    SERVICE_TCP, 0);
 		packet = next;
@@ -2122,5 +2123,5 @@
 		return NO_DATA;
 
-	rc = packet_translate_remote(tcp_globals.net_phone, &packet, packet_id);
+	rc = packet_translate_remote(tcp_globals.net_sess, &packet, packet_id);
 	if (rc != EOK)
 		return rc;
@@ -2133,5 +2134,5 @@
 	/* Release the packet */
 	dyn_fifo_pop(&socket->received);
-	pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+	pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 
 	/* Return the total length */
@@ -2171,5 +2172,5 @@
 		return ENOTCONN;
 
-	rc = tl_get_ip_packet_dimension(tcp_globals.ip_phone,
+	rc = tl_get_ip_packet_dimension(tcp_globals.ip_sess,
 	    &tcp_globals.dimensions, socket_data->device_id, &packet_dimension);
 	if (rc != EOK)
@@ -2182,5 +2183,5 @@
 	for (index = 0; index < fragments; index++) {
 		/* Read the data fragment */
-		result = tl_socket_read_packet_data(tcp_globals.net_phone,
+		result = tl_socket_read_packet_data(tcp_globals.net_sess,
 		    &packet, TCP_HEADER_SIZE, packet_dimension,
 		    socket_data->addr, socket_data->addrlen);
@@ -2245,5 +2246,5 @@
 	default:
 		/* Just destroy */
-		rc = socket_destroy(tcp_globals.net_phone, socket_id,
+		rc = socket_destroy(tcp_globals.net_sess, socket_id,
 		    local_sockets, &tcp_globals.sockets,
 		    tcp_free_socket_data);
@@ -2293,5 +2294,5 @@
 
 	/* Get the device packet dimension */
-	rc = tl_get_ip_packet_dimension(tcp_globals.ip_phone,
+	rc = tl_get_ip_packet_dimension(tcp_globals.ip_sess,
 	    &tcp_globals.dimensions, socket_data->device_id, &packet_dimension);
 	if (rc != EOK)
@@ -2299,5 +2300,5 @@
 
 	/* Get a new packet */
-	*packet = packet_get_4_remote(tcp_globals.net_phone, TCP_HEADER_SIZE,
+	*packet = packet_get_4_remote(tcp_globals.net_sess, TCP_HEADER_SIZE,
 	    packet_dimension->addr_len, packet_dimension->prefix,
 	    packet_dimension->suffix);
@@ -2362,5 +2363,5 @@
 			if (rc != EOK)
 				return rc;
-			rc = tl_get_ip_packet_dimension(tcp_globals.ip_phone,
+			rc = tl_get_ip_packet_dimension(tcp_globals.ip_sess,
 			    &tcp_globals.dimensions, socket_data->device_id,
 			    &packet_dimension);
@@ -2434,5 +2435,5 @@
 int tcp_release_and_return(packet_t *packet, int result)
 {
-	pq_release_remote(tcp_globals.net_phone, packet_get_id(packet));
+	pq_release_remote(tcp_globals.net_sess, packet_get_id(packet));
 	return result;
 }
@@ -2443,4 +2444,5 @@
  * @param[in,out] icall Message parameters.
  * @param[in]     arg   Local argument.
+ *
  */
 static void tcp_receiver(ipc_callid_t iid, ipc_call_t *icall, void *arg)
@@ -2452,5 +2454,5 @@
 		switch (IPC_GET_IMETHOD(*icall)) {
 		case NET_TL_RECEIVED:
-			rc = packet_translate_remote(tcp_globals.net_phone, &packet,
+			rc = packet_translate_remote(tcp_globals.net_sess, &packet,
 			    IPC_GET_PACKET(*icall));
 			if (rc == EOK)
@@ -2470,5 +2472,5 @@
 /** Initialize the TCP module.
  *
- * @param[in] net_phone Network module phone.
+ * @param[in] sess Network module session.
  *
  * @return EOK on success.
@@ -2476,17 +2478,17 @@
  *
  */
-int tl_initialize(int net_phone)
+int tl_initialize(async_sess_t *sess)
 {
 	fibril_rwlock_initialize(&tcp_globals.lock);
 	fibril_rwlock_write_lock(&tcp_globals.lock);
 	
-	tcp_globals.net_phone = net_phone;
+	tcp_globals.net_sess = sess;
 	
-	tcp_globals.icmp_phone = icmp_connect_module();
-	tcp_globals.ip_phone = ip_bind_service(SERVICE_IP, IPPROTO_TCP,
+	tcp_globals.icmp_sess = icmp_connect_module();
+	tcp_globals.ip_sess = ip_bind_service(SERVICE_IP, IPPROTO_TCP,
 	    SERVICE_TCP, tcp_receiver);
-	if (tcp_globals.ip_phone < 0) {
+	if (tcp_globals.ip_sess == NULL) {
 		fibril_rwlock_write_unlock(&tcp_globals.lock);
-		return tcp_globals.ip_phone;
+		return ENOENT;
 	}
 	
Index: uspace/srv/net/tl/tcp/tcp.h
===================================================================
--- uspace/srv/net/tl/tcp/tcp.h	(revision bf1728257878be61830ed8a583f39ba76e6d3b18)
+++ uspace/srv/net/tl/tcp/tcp.h	(revision b366a6f4b86cb7fe82fcf415965c5a7de1a59638)
@@ -38,6 +38,6 @@
 #define NET_TCP_H_
 
+#include <async.h>
 #include <fibril_synch.h>
-
 #include <net/packet.h>
 #include <net/device.h>
@@ -284,10 +284,10 @@
 /** TCP global data. */
 struct tcp_globals {
-	/** Networking module phone. */
-	int net_phone;
-	/** IP module phone. */
-	int ip_phone;
-	/** ICMP module phone. */
-	int icmp_phone;
+	/** Networking module session. */
+	async_sess_t *net_sess;
+	/** IP module session. */
+	async_sess_t *ip_sess;
+	/** ICMP module session. */
+	async_sess_t *icmp_sess;
 	/** Last used free port. */
 	int last_used_port;
Index: uspace/srv/net/tl/udp/udp.c
===================================================================
--- uspace/srv/net/tl/udp/udp.c	(revision bf1728257878be61830ed8a583f39ba76e6d3b18)
+++ uspace/srv/net/tl/udp/udp.c	(revision b366a6f4b86cb7fe82fcf415965c5a7de1a59638)
@@ -37,5 +37,4 @@
 
 #include <async.h>
-#include <async_obsolete.h>
 #include <fibril_synch.h>
 #include <malloc.h>
@@ -71,7 +70,4 @@
 #include "udp_header.h"
 
-// FIXME: remove this header
-#include <kernel/ipc/ipc_methods.h>
-
 /** UDP module name. */
 #define NAME  "udp"
@@ -103,5 +99,5 @@
 static int udp_release_and_return(packet_t *packet, int result)
 {
-	pq_release_remote(udp_globals.net_phone, packet_get_id(packet));
+	pq_release_remote(udp_globals.net_sess, packet_get_id(packet));
 	return result;
 }
@@ -196,7 +192,7 @@
 	    ntohs(header->destination_port), (uint8_t *) SOCKET_MAP_KEY_LISTENING, 0);
 	if (!socket) {
-		if (tl_prepare_icmp_packet(udp_globals.net_phone,
-		    udp_globals.icmp_phone, packet, error) == EOK) {
-			icmp_destination_unreachable_msg(udp_globals.icmp_phone,
+		if (tl_prepare_icmp_packet(udp_globals.net_sess,
+		    udp_globals.icmp_sess, packet, error) == EOK) {
+			icmp_destination_unreachable_msg(udp_globals.icmp_sess,
 			    ICMP_PORT_UNREACH, 0, packet);
 		}
@@ -255,5 +251,5 @@
 			while (tmp_packet) {
 				next_packet = pq_detach(tmp_packet);
-				pq_release_remote(udp_globals.net_phone,
+				pq_release_remote(udp_globals.net_sess,
 				    packet_get_id(tmp_packet));
 				tmp_packet = next_packet;
@@ -278,9 +274,9 @@
 		if (flip_checksum(compact_checksum(checksum)) !=
 		    IP_CHECKSUM_ZERO) {
-			if (tl_prepare_icmp_packet(udp_globals.net_phone,
-			    udp_globals.icmp_phone, packet, error) == EOK) {
+			if (tl_prepare_icmp_packet(udp_globals.net_sess,
+			    udp_globals.icmp_sess, packet, error) == EOK) {
 				/* Checksum error ICMP */
 				icmp_parameter_problem_msg(
-				    udp_globals.icmp_phone, ICMP_PARAM_POINTER,
+				    udp_globals.icmp_sess, ICMP_PARAM_POINTER,
 				    ((size_t) ((void *) &header->checksum)) -
 				    ((size_t) ((void *) header)), packet);
@@ -296,5 +292,5 @@
 		return udp_release_and_return(packet, rc);
 		
-	rc = tl_get_ip_packet_dimension(udp_globals.ip_phone,
+	rc = tl_get_ip_packet_dimension(udp_globals.ip_sess,
 	    &udp_globals.dimensions, device_id, &packet_dimension);
 	if (rc != EOK)
@@ -303,7 +299,9 @@
 	/* Notify the destination socket */
 	fibril_rwlock_write_unlock(&udp_globals.lock);
-	async_obsolete_msg_5(socket->phone, NET_SOCKET_RECEIVED,
-	    (sysarg_t) socket->socket_id, packet_dimension->content, 0, 0,
-	    (sysarg_t) fragments);
+	
+	async_exch_t *exch = async_exchange_begin(socket->sess);
+	async_msg_5(exch, NET_SOCKET_RECEIVED, (sysarg_t) socket->socket_id,
+	    packet_dimension->content, 0, 0, (sysarg_t) fragments);
+	async_exchange_end(exch);
 
 	return EOK;
@@ -342,4 +340,5 @@
  * @param[in,out] icall Message parameters.
  * @param[in]     arg   Local argument.
+ *
  */
 static void udp_receiver(ipc_callid_t iid, ipc_call_t *icall, void *arg)
@@ -351,5 +350,5 @@
 		switch (IPC_GET_IMETHOD(*icall)) {
 		case NET_TL_RECEIVED:
-			rc = packet_translate_remote(udp_globals.net_phone, &packet,
+			rc = packet_translate_remote(udp_globals.net_sess, &packet,
 			    IPC_GET_PACKET(*icall));
 			if (rc == EOK)
@@ -369,5 +368,5 @@
 /** Initialize the UDP module.
  *
- * @param[in] net_phone Network module phone.
+ * @param[in] sess Network module session.
  *
  * @return EOK on success.
@@ -375,5 +374,5 @@
  *
  */
-int tl_initialize(int net_phone)
+int tl_initialize(async_sess_t *sess)
 {
 	measured_string_t names[] = {
@@ -394,17 +393,16 @@
 	fibril_rwlock_write_lock(&udp_globals.lock);
 	
-	udp_globals.net_phone = net_phone;
-	
-	udp_globals.icmp_phone = icmp_connect_module();
-	
-	udp_globals.ip_phone = ip_bind_service(SERVICE_IP, IPPROTO_UDP,
-	    SERVICE_UDP, udp_receiver);
-	if (udp_globals.ip_phone < 0) {
-		fibril_rwlock_write_unlock(&udp_globals.lock);
-		return udp_globals.ip_phone;
+	udp_globals.net_sess = sess;
+	udp_globals.icmp_sess = icmp_connect_module();
+	
+	udp_globals.ip_sess = ip_bind_service(SERVICE_IP, IPPROTO_UDP,
+	     SERVICE_UDP, udp_receiver);
+	if (udp_globals.ip_sess == NULL) {
+	    fibril_rwlock_write_unlock(&udp_globals.lock);
+	    return ENOENT;
 	}
 	
 	/* Read default packet dimensions */
-	int rc = ip_packet_size_req(udp_globals.ip_phone, -1,
+	int rc = ip_packet_size_req(udp_globals.ip_sess, -1,
 	    &udp_globals.packet_dimension);
 	if (rc != EOK) {
@@ -435,5 +433,5 @@
 	/* Get configuration */
 	configuration = &names[0];
-	rc = net_get_conf_req(udp_globals.net_phone, &configuration, count,
+	rc = net_get_conf_req(udp_globals.net_sess, &configuration, count,
 	    &data);
 	if (rc != EOK) {
@@ -529,10 +527,10 @@
 
 	if (udp_globals.checksum_computing) {
-		rc = ip_get_route_req(udp_globals.ip_phone, IPPROTO_UDP, addr,
+		rc = ip_get_route_req(udp_globals.ip_sess, IPPROTO_UDP, addr,
 		    addrlen, &device_id, &ip_header, &headerlen);
 		if (rc != EOK)
 			return rc;
 		/* Get the device packet dimension */
-//		rc = tl_get_ip_packet_dimension(udp_globals.ip_phone,
+//		rc = tl_get_ip_packet_dimension(udp_globals.ip_sess,
 //		    &udp_globals.dimensions, device_id, &packet_dimension);
 //		if (rc != EOK)
@@ -541,5 +539,5 @@
 //	} else {
 		/* Do not ask all the time */
-		rc = ip_packet_size_req(udp_globals.ip_phone, -1,
+		rc = ip_packet_size_req(udp_globals.ip_sess, -1,
 		    &udp_globals.packet_dimension);
 		if (rc != EOK)
@@ -559,5 +557,5 @@
 
 	/* Read the first packet fragment */
-	result = tl_socket_read_packet_data(udp_globals.net_phone, &packet,
+	result = tl_socket_read_packet_data(udp_globals.net_sess, &packet,
 	    UDP_HEADER_SIZE, packet_dimension, addr, addrlen);
 	if (result < 0)
@@ -580,5 +578,5 @@
 	/* Read the rest of the packet fragments */
 	for (index = 1; index < fragments; index++) {
-		result = tl_socket_read_packet_data(udp_globals.net_phone,
+		result = tl_socket_read_packet_data(udp_globals.net_sess,
 		    &next_packet, 0, packet_dimension, addr, addrlen);
 		if (result < 0)
@@ -632,5 +630,5 @@
 
 	/* Send the packet */
-	ip_send_msg(udp_globals.ip_phone, device_id, packet, SERVICE_UDP, 0);
+	ip_send_msg(udp_globals.ip_sess, device_id, packet, SERVICE_UDP, 0);
 
 	return EOK;
@@ -679,5 +677,5 @@
 		return NO_DATA;
 	
-	rc = packet_translate_remote(udp_globals.net_phone, &packet, packet_id);
+	rc = packet_translate_remote(udp_globals.net_sess, &packet, packet_id);
 	if (rc != EOK) {
 		(void) dyn_fifo_pop(&socket->received);
@@ -739,19 +737,22 @@
 }
 
-/** Processes the socket client messages.
- *
- * Runs until the client module disconnects.
- *
- * @param[in] callid 	The message identifier.
- * @param[in] call	The message parameters.
- * @return		EOK on success.
- *
- * @see	socket.h
- */
-static int udp_process_client_messages(ipc_callid_t callid, ipc_call_t call)
+/** Process the socket client messages.
+ *
+ * Run until the client module disconnects.
+ *
+ * @see socket.h
+ *
+ * @param[in] sess   Callback session.
+ * @param[in] callid Message identifier.
+ * @param[in] call   Message parameters.
+ *
+ * @return EOK on success.
+ *
+ */
+static int udp_process_client_messages(async_sess_t *sess, ipc_callid_t callid,
+    ipc_call_t call)
 {
 	int res;
 	socket_cores_t local_sockets;
-	int app_phone = IPC_GET_PHONE(call);
 	struct sockaddr *addr;
 	int socket_id;
@@ -786,15 +787,15 @@
 		/* Get the next call */
 		callid = async_get_call(&call);
-		
+
+		/* Process the call */
 		if (!IPC_GET_IMETHOD(call)) {
 			res = EHANGUP;
 			break;
 		}
-
-		/* Process the call */
+		
 		switch (IPC_GET_IMETHOD(call)) {
 		case NET_SOCKET:
 			socket_id = SOCKET_GET_SOCKET_ID(call);
-			res = socket_create(&local_sockets, app_phone, NULL,
+			res = socket_create(&local_sockets, sess, NULL,
 			    &socket_id);
 			SOCKET_SET_SOCKET_ID(answer, socket_id);
@@ -804,5 +805,5 @@
 			
 			size = MAX_UDP_FRAGMENT_SIZE;
-			if (tl_get_ip_packet_dimension(udp_globals.ip_phone,
+			if (tl_get_ip_packet_dimension(udp_globals.ip_sess,
 			    &udp_globals.dimensions, DEVICE_INVALID_ID,
 			    &packet_dimension) == EOK) {
@@ -868,5 +869,5 @@
 		case NET_SOCKET_CLOSE:
 			fibril_rwlock_write_lock(&udp_globals.lock);
-			res = socket_destroy(udp_globals.net_phone,
+			res = socket_destroy(udp_globals.net_sess,
 			    SOCKET_GET_SOCKET_ID(call), &local_sockets,
 			    &udp_globals.sockets, NULL);
@@ -882,9 +883,9 @@
 	}
 
-	/* Release the application phone */
-	async_obsolete_hangup(app_phone);
+	/* Release the application session */
+	async_hangup(sess);
 
 	/* Release all local sockets */
-	socket_cores_release(udp_globals.net_phone, &local_sockets,
+	socket_cores_release(udp_globals.net_sess, &local_sockets,
 	    &udp_globals.sockets, NULL);
 
@@ -916,10 +917,10 @@
 {
 	*answer_count = 0;
-
-	switch (IPC_GET_IMETHOD(*call)) {
-	case IPC_M_CONNECT_TO_ME:
-		return udp_process_client_messages(callid, *call);
-	}
-
+	
+	async_sess_t *callback =
+	    async_callback_receive_start(EXCHANGE_SERIALIZE, call);
+	if (callback)
+		return udp_process_client_messages(callback, callid, *call);
+	
 	return ENOTSUP;
 }
Index: uspace/srv/net/tl/udp/udp.h
===================================================================
--- uspace/srv/net/tl/udp/udp.h	(revision bf1728257878be61830ed8a583f39ba76e6d3b18)
+++ uspace/srv/net/tl/udp/udp.h	(revision b366a6f4b86cb7fe82fcf415965c5a7de1a59638)
@@ -38,4 +38,5 @@
 #define NET_UDP_H_
 
+#include <async.h>
 #include <fibril_synch.h>
 #include <socket_core.h>
@@ -49,10 +50,10 @@
 /** UDP global data. */
 struct udp_globals {
-	/** Networking module phone. */
-	int net_phone;
-	/** IP module phone. */
-	int ip_phone;
-	/** ICMP module phone. */
-	int icmp_phone;
+	/** Networking module session. */
+	async_sess_t *net_sess;
+	/** IP module session. */
+	async_sess_t *ip_sess;
+	/** ICMP module session. */
+	async_sess_t *icmp_sess;
 	/** Packet dimension. */
 	packet_dimension_t packet_dimension;