Index: abi/include/abi/ipc/ipc.h
===================================================================
--- abi/include/abi/ipc/ipc.h	(revision e3444229c8e3295e9e2bed75246c19263f3c51a6)
+++ abi/include/abi/ipc/ipc.h	(revision 208db5ac8515f1f9a7936d74f0371c0ba4f5bf48)
@@ -35,4 +35,7 @@
 #ifndef ABI_IPC_IPC_H_
 #define ABI_IPC_IPC_H_
+
+#include <abi/proc/task.h>
+#include <abi/cap.h>
 
 /** Length of data being transferred with IPC call
@@ -108,4 +111,21 @@
 #define IPC_FIRST_USER_METHOD  1024
 
+typedef struct {
+	sysarg_t args[IPC_CALL_LEN];
+	/**
+	 * Task which made or forwarded the call with IPC_FF_ROUTE_FROM_ME,
+	 * or the task which answered the call.
+	 */
+	task_id_t task_id;
+	/** Flags */
+	unsigned flags;
+	/** User-defined label associated with requests */
+	sysarg_t request_label;
+	/** User-defined label associated with answers */
+	sysarg_t answer_label;
+	/** Capability handle */
+	cap_call_handle_t cap_handle;
+} ipc_data_t;
+
 #endif
 
Index: abi/include/abi/ipc/methods.h
===================================================================
--- abi/include/abi/ipc/methods.h	(revision e3444229c8e3295e9e2bed75246c19263f3c51a6)
+++ abi/include/abi/ipc/methods.h	(revision 208db5ac8515f1f9a7936d74f0371c0ba4f5bf48)
@@ -71,4 +71,5 @@
 	 *            arg3 .. <custom>
 	 *            arg4 .. <unused>
+	 *            arg5 .. sender-assigned label
 	 *  - kernel: arg5 .. new recipient's connection phone capability
 	 *
@@ -78,5 +79,5 @@
 	 *            arg3 .. <unused>
 	 *            arg4 .. <unused>
-	 *  - kernel: arg5 .. new recipient's connection phone hash
+	 *            arg5 .. <unused>
 	 *
 	 */
@@ -95,5 +96,5 @@
 	 *            arg3 .. <custom>
 	 *            arg4 .. flags (e.g. IPC_FLAG_BLOCKING)
-	 *  - kernel: arg5 .. new sender's connection phone hash
+	 *            arg5 .. unused
 	 *
 	 * Recipient:
@@ -102,4 +103,5 @@
 	 *            arg3 .. <unused>
 	 *            arg4 .. <unused>
+	 *            arg5 .. recipient-assigned label
 	 *  - kernel: arg5 .. new sender's connection phone capability
 	 *