diff --git a/src/ipc.h b/src/ipc.h
index f487948..876b843 100644
--- a/src/ipc.h
+++ b/src/ipc.h
@@ -247,10 +247,10 @@ struct ipc_messages {
 struct ipc_switching {
 	int orig;
 	int dest;
-	int (*orig_in)  (int origin_fd, struct ipc_message *m);
-	int (*orig_out) (int origin_fd, struct ipc_message *m);
-	int (*dest_in)  (int origin_fd, struct ipc_message *m);
-	int (*dest_out) (int origin_fd, struct ipc_message *m);
+	enum ipccb (*orig_in)  (int origin_fd, struct ipc_message *m);
+	enum ipccb (*orig_out) (int origin_fd, struct ipc_message *m);
+	enum ipccb (*dest_in)  (int origin_fd, struct ipc_message *m);
+	enum ipccb (*dest_out) (int origin_fd, struct ipc_message *m);
 };
 
 struct ipc_switchings {
@@ -392,6 +392,11 @@ void ipc_switching_add (struct ipc_switchings *is, int orig, int dest);
 int ipc_switching_del (struct ipc_switchings *is, int fd);
 int ipc_switching_get (struct ipc_switchings *is, int fd);
 void ipc_switching_free (struct ipc_switchings *is);
+void ipc_switching_callbacks (
+	  struct ipc_ctx *ctx
+	, int fd
+	, enum ipccb (*cb_in )(int fd, struct ipc_message *m)
+	, enum ipccb (*cb_out)(int fd, struct ipc_message *m));
 
 int ipc_ctx_fd_type (struct ipc_ctx *ctx, int fd, enum ipc_connection_type type);
 
diff --git a/src/network.c b/src/network.c
index 910f323..f07ad8d 100644
--- a/src/network.c
+++ b/src/network.c
@@ -145,14 +145,14 @@ int ipc_switching_del (struct ipc_switchings *is, int fd)
  */
 int ipc_switching_get_ (const struct ipc_switchings *is
 	, int fd
-	, struct ipc_switching *s)
+	, struct ipc_switching **s)
 {
 	for (size_t i = 0; i < is->size; i++) {
 		if (is->collection[i].orig == fd) {
-			*s = is->collection[i];
+			*s = &is->collection[i];
 			return 0;
 		} else if (is->collection[i].dest == fd) {
-			*s = is->collection[i];
+			*s = &is->collection[i];
 			return 1;
 		}
 	}
@@ -239,6 +239,28 @@ default_cb_out(int fd, struct ipc_message *m)
 	return IPC_CB_NO_ERROR;
 }
 
+void ipc_switching_callbacks (
+	  struct ipc_ctx *ctx
+	, int fd
+	, enum ipccb (*cb_in )(int fd, struct ipc_message *m)
+	, enum ipccb (*cb_out)(int fd, struct ipc_message *m))
+{
+	struct ipc_switching *sw = NULL;
+	int is_valid = ipc_switching_get_ (&ctx->switchdb, fd, &sw);
+	if (is_valid == -1) {
+		return;
+	}
+
+	if (sw->orig == fd) {
+		sw->orig_in  = cb_in;
+		sw->orig_out = cb_out;
+	}
+	else {
+		sw->dest_in  = cb_in;
+		sw->dest_out = cb_out;
+	}
+}
+
 /**
  * fd_switching_read allows to read a message from a switched fd.
  */
@@ -252,7 +274,7 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 
 	int talkingfd = ctx->pollfd[index].fd;
 	int dest_fd = -1;
-	struct ipc_switching sw;
+	struct ipc_switching *sw = NULL;
 	struct ipc_message m;
 
 	enum ipccb r;
@@ -262,22 +284,22 @@ struct ipc_error fd_switching_read (struct ipc_event *event, struct ipc_ctx *ctx
 
 	T_R ((is_valid == -1), IPC_ERROR_FD_SWITCHING__NO_FD_RECORD);
 
-	if (sw.orig == talkingfd) {
-		dest_fd = sw.dest;
-		if (sw.orig_in == NULL) {
+	if (sw->orig == talkingfd) {
+		dest_fd = sw->dest;
+		if (sw->orig_in == NULL) {
 			r = default_cb_in (talkingfd, &m);
 		}
 		else {
-			r = (*sw.orig_in)(talkingfd, &m);
+			r = (*sw->orig_in)(talkingfd, &m);
 		}
 	}
 	else {
-		dest_fd = sw.orig;
-		if (sw.dest_in == NULL) {
+		dest_fd = sw->orig;
+		if (sw->dest_in == NULL) {
 			r = default_cb_in (talkingfd, &m);
 		}
 		else {
-			r = (*sw.dest_in)(talkingfd, &m);
+			r = (*sw->dest_in)(talkingfd, &m);
 		}
 	}
 
@@ -330,7 +352,7 @@ struct ipc_error fd_switching_write (struct ipc_event *event, struct ipc_ctx *ct
 	T_R ((ctx->switchdb.size == 0), IPC_ERROR_FD_SWITCHING__NO_FD_RECORD);
 
 	int output_fd = ctx->pollfd[index].fd;
-	struct ipc_switching sw;
+	struct ipc_switching *sw = NULL;
 	struct ipc_message *m = NULL;
 	size_t i;
 
@@ -351,20 +373,20 @@ struct ipc_error fd_switching_write (struct ipc_event *event, struct ipc_ctx *ct
 
 	T_R ((is_valid == -1), IPC_ERROR_FD_SWITCHING__NO_FD_RECORD);
 
-	if (sw.orig == output_fd) {
-		if (sw.orig_in == NULL) {
+	if (sw->orig == output_fd) {
+		if (sw->orig_in == NULL) {
 			r = default_cb_out (output_fd, m);
 		}
 		else {
-			r = (*sw.orig_out)(output_fd, m);
+			r = (*sw->orig_out)(output_fd, m);
 		}
 	}
 	else {
-		if (sw.dest_in == NULL) {
+		if (sw->dest_in == NULL) {
 			r = default_cb_out (output_fd, m);
 		}
 		else {
-			r = (*sw.dest_out)(output_fd, m);
+			r = (*sw->dest_out)(output_fd, m);
 		}
 	}