Index: kernel/generic/include/ipc/ipc.h
===================================================================
--- kernel/generic/include/ipc/ipc.h	(revision cd671c3d0b2c39e24a8731d0ec7f631bdb39f864)
+++ kernel/generic/include/ipc/ipc.h	(revision a05f2af2f058ddcf89958654f2feb3db043e5a3d)
@@ -65,4 +65,5 @@
 	mutex_t lock;
 	link_t link;
+	struct task *caller;
 	struct answerbox *callee;
 	ipc_phone_state_t state;
@@ -177,5 +178,5 @@
 extern void _ipc_answer_free_call(call_t *, bool);
 
-extern void ipc_phone_init(phone_t *);
+extern void ipc_phone_init(phone_t *, struct task *);
 extern bool ipc_phone_connect(phone_t *, answerbox_t *);
 extern int ipc_phone_hangup(phone_t *);