diff --git a/libs/esl/ivrd.c b/libs/esl/ivrd.c
index 9e4326d58a..865016506b 100644
--- a/libs/esl/ivrd.c
+++ b/libs/esl/ivrd.c
@@ -45,7 +45,7 @@ static void handle_SIGCHLD(int sig)
 	return;
 }
 
-static void my_forking_callback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr)
+static void my_forking_callback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr, void *user_data)
 {
 	esl_handle_t handle = {{0}};
 	char path_buffer[1024] = { 0 };
@@ -91,7 +91,7 @@ static void my_forking_callback(esl_socket_t server_sock, esl_socket_t client_so
 	exit(0);
 }
 
-static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr)
+static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr, void *user_data)
 {
 	esl_handle_t handle = {{0}};
 	const char *path;
@@ -162,11 +162,11 @@ int main(int argc, char *argv[])
 	if (thread) {
 		printf("Starting threaded listener.\n");
 		fflush(stdout);
-		esl_listen_threaded(ip, port, mycallback, 100000);
+		esl_listen_threaded(ip, port, mycallback, NULL, 100000);
 	} else {
 		printf("Starting forking listener.\n");
 		fflush(stdout);
-		esl_listen(ip, port, my_forking_callback, NULL);
+		esl_listen(ip, port, my_forking_callback, NULL, NULL);
 	}
 
 	return 0;
diff --git a/libs/esl/src/esl.c b/libs/esl/src/esl.c
index f264f24d73..587db6c75e 100644
--- a/libs/esl/src/esl.c
+++ b/libs/esl/src/esl.c
@@ -645,13 +645,14 @@ struct thread_handler {
 	esl_socket_t server_sock;
 	esl_socket_t client_sock;
 	struct sockaddr_in addr;
+	void *user_data;
 };
 
 static void *client_thread(esl_thread_t *me, void *obj)
 {
 	struct thread_handler *handler = (struct thread_handler *) obj;
 
-	handler->callback(handler->server_sock, handler->client_sock, &handler->addr);
+	handler->callback(handler->server_sock, handler->client_sock, &handler->addr, handler->user_data);
 	free(handler);
 
 	return NULL;
@@ -679,7 +680,7 @@ static int prepare_sock(esl_socket_t sock)
 }
 
 
-ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_listen_callback_t callback, esl_socket_t *server_sockP)
+ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_listen_callback_t callback, void *user_data, esl_socket_t *server_sockP)
 {
 	esl_socket_t server_sock = ESL_SOCK_INVALID;
 	struct sockaddr_in addr;
@@ -728,7 +729,7 @@ ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_list
 			goto end;
 		}
 		prepare_sock(client_sock);
-		callback(server_sock, client_sock, &echoClntAddr);
+		callback(server_sock, client_sock, &echoClntAddr, user_data);
 	}
 
  end:
@@ -742,7 +743,7 @@ ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_list
 
 }
 
-ESL_DECLARE(esl_status_t) esl_listen_threaded(const char *host, esl_port_t port, esl_listen_callback_t callback, int max)
+ESL_DECLARE(esl_status_t) esl_listen_threaded(const char *host, esl_port_t port, esl_listen_callback_t callback, void *user_data, int max)
 {
 	esl_socket_t server_sock = ESL_SOCK_INVALID;
 	struct sockaddr_in addr;
@@ -796,6 +797,7 @@ ESL_DECLARE(esl_status_t) esl_listen_threaded(const char *host, esl_port_t port,
 		handler->server_sock = server_sock;
 		handler->client_sock = client_sock;
 		handler->addr = echoClntAddr;
+		handler->user_data = user_data;
 		esl_thread_create_detached(client_thread, handler);
 	}
 
diff --git a/libs/esl/src/include/esl.h b/libs/esl/src/include/esl.h
index 144918eacd..1abdd241f6 100644
--- a/libs/esl/src/include/esl.h
+++ b/libs/esl/src/include/esl.h
@@ -379,7 +379,7 @@ ESL_DECLARE(int) esl_tolower(int c);
 ESL_DECLARE(int) esl_snprintf(char *buffer, size_t count, const char *fmt, ...);
 
 
-typedef void (*esl_listen_callback_t)(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr);
+typedef void (*esl_listen_callback_t)(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr, void *user_data);
 /*!
     \brief Attach a handle to an established socket connection
     \param handle Handle to be attached
@@ -394,8 +394,8 @@ ESL_DECLARE(esl_status_t) esl_attach_handle(esl_handle_t *handle, esl_socket_t s
     \param callback Callback that will be called upon data received
 */
 
-ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_listen_callback_t callback, esl_socket_t *server_sockP);
-ESL_DECLARE(esl_status_t) esl_listen_threaded(const char *host, esl_port_t port, esl_listen_callback_t callback, int max);
+ESL_DECLARE(esl_status_t) esl_listen(const char *host, esl_port_t port, esl_listen_callback_t callback, void *user_data, esl_socket_t *server_sockP);
+ESL_DECLARE(esl_status_t) esl_listen_threaded(const char *host, esl_port_t port, esl_listen_callback_t callback, void *user_data, int max);
 /*!
     \brief Executes application with sendmsg to a specific UUID. Used for outbound socket.
     \param handle Handle that the msg will be sent
diff --git a/libs/esl/testserver.c b/libs/esl/testserver.c
index 13df29c332..3bf23139e6 100644
--- a/libs/esl/testserver.c
+++ b/libs/esl/testserver.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <esl.h>
 
-static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr)
+static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr, void *user_data)
 {
 	esl_handle_t handle = {{0}};
 	int done = 0;
@@ -48,7 +48,7 @@ static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struc
 int main(void)
 {
 	esl_global_set_default_logger(7);
-	esl_listen_threaded("localhost", 8040, mycallback, 100000);
+	esl_listen_threaded("localhost", 8040, mycallback, NULL, 100000);
 	
 	return 0;
 }
diff --git a/libs/esl/testserver_fork.c b/libs/esl/testserver_fork.c
index 54c0238a3c..eb377cc668 100644
--- a/libs/esl/testserver_fork.c
+++ b/libs/esl/testserver_fork.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <esl.h>
 
-static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr)
+static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr, void *user_data)
 {
 	esl_handle_t handle = {{0}};
 	int done = 0;
@@ -66,7 +66,7 @@ int main(void)
 	signal(SIGCHLD, SIG_IGN);
 
 	esl_global_set_default_logger(7);
-	esl_listen("localhost", 8040, mycallback, &server_sock);
+	esl_listen("localhost", 8040, mycallback, NULL, &server_sock);
 
 	return 0;
 }