diff --git a/transport.c b/transport.c
index b2d4dd1..fc18740 100644
--- a/transport.c
+++ b/transport.c
@@ -58,6 +58,14 @@ int transport_peer(struct transport *t, struct fdarray *fda, int event,
 	return t->send(t, fda, event, 1, msg, len, NULL, &msg->hwts);
 }
 
+int transport_sendto(struct transport *t, struct fdarray *fda, int event,
+		     struct ptp_message *msg)
+{
+	int len = ntohs(msg->header.messageLength);
+
+	return t->send(t, fda, event, 0, msg, len, &msg->address, &msg->hwts);
+}
+
 int transport_physical_addr(struct transport *t, uint8_t *addr)
 {
 	if (t->physical_addr) {
diff --git a/transport.h b/transport.h
index 5153c46..8e0d421 100644
--- a/transport.h
+++ b/transport.h
@@ -57,12 +57,45 @@ int transport_open(struct transport *t, const char *name,
 
 int transport_recv(struct transport *t, int fd, struct ptp_message *msg);
 
+/**
+ * Sends the PTP message using the given transport. The message is sent to
+ * the default (usually multicast) address, any address field in the
+ * ptp_message itself is ignored.
+ * @param t	The transport.
+ * @param fda	The array of descriptors filled in by transport_open.
+ * @param event	1 for event message, 0 for general message.
+ * @param msg	The message to send.
+ * @return	Number of bytes send, or negative value in case of an error.
+ */
 int transport_send(struct transport *t, struct fdarray *fda, int event,
 		   struct ptp_message *msg);
 
+/**
+ * Sends the PTP message using the given transport. The message is sent to
+ * the address used for p2p delay measurements (usually a multicast
+ * address), any address field in the ptp_message itself is ignored.
+ * @param t	The transport.
+ * @param fda	The array of descriptors filled in by transport_open.
+ * @param event	1 for event message, 0 for general message.
+ * @param msg	The message to send.
+ * @return	Number of bytes send, or negative value in case of an error.
+ */
 int transport_peer(struct transport *t, struct fdarray *fda, int event,
 		   struct ptp_message *msg);
 
+/**
+ * Sends the PTP message using the given transport. The address has to be
+ * provided in the address field of the message.
+ * @param t	The transport.
+ * @param fda	The array of descriptors filled in by transport_open.
+ * @param event	1 for event message, 0 for general message.
+ * @param msg	The message to send. The address of the destination has to
+ *		be set in the address field.
+ * @return	Number of bytes send, or negative value in case of an error.
+ */
+int transport_sendto(struct transport *t, struct fdarray *fda, int event,
+		     struct ptp_message *msg);
+
 /**
  * Returns the transport's type.
  */