diff --git a/include/osmocom/mgcp/mgcp_common.h b/include/osmocom/mgcp/mgcp_common.h
index eb6564f..b2c7370 100644
--- a/include/osmocom/mgcp/mgcp_common.h
+++ b/include/osmocom/mgcp/mgcp_common.h
@@ -49,6 +49,14 @@
 	MGCP_CONN_LOOPBACK  = 4 | MGCP_CONN_RECV_SEND,
 };
 
+#define MGCP_X_OSMO_IGN_HEADER "X-Osmo-IGN:"
+
+/* Values should be bitwise-OR-able */
+enum mgcp_x_osmo_ign {
+	MGCP_X_OSMO_IGN_NONE = 0,
+	MGCP_X_OSMO_IGN_CALLID = 1,
+};
+
 /* Ensure that the msg->l2h is NUL terminated. */
 static inline int mgcp_msg_terminate_nul(struct msgb *msg)
 {
diff --git a/include/osmocom/mgcp/mgcp_endp.h b/include/osmocom/mgcp/mgcp_endp.h
index 3876794..d834c09 100644
--- a/include/osmocom/mgcp/mgcp_endp.h
+++ b/include/osmocom/mgcp/mgcp_endp.h
@@ -90,6 +90,9 @@
 	/*! Memorize if this endpoint was choosen by the MGW (wildcarded, true)
 	 *   or if the user has choosen the particular endpoint explicitly. */
 	bool wildcarded_req;
+
+	/*! MGCP_X_OSMO_IGN_* flags from 'X-Osmo-IGN:' header */
+	uint32_t x_osmo_ign;
 };
 
 /*! Extract endpoint number for a given endpoint */