#define RX_CALL_REFCOUNT_ALIVE 3 /* keep alive event */
#define RX_CALL_REFCOUNT_PACKET 4 /* waiting for packets. */
#define RX_CALL_REFCOUNT_SEND 5 /* rxi_Send */
-#define RX_CALL_REFCOUNT_ACKALL 6 /* rxi_AckAll */
#define RX_CALL_REFCOUNT_ABORT 7 /* delayed abort */
#define RX_CALL_REFCOUNT_MTU 8 /* grow mtu event */
#define RX_CALL_REFCOUNT_MAX 9 /* array size. */