diff --git a/include/re_rtp.h b/include/re_rtp.h
index 5bc166e..06c7ff3 100644
--- a/include/re_rtp.h
+++ b/include/re_rtp.h
@@ -204,10 +204,10 @@ int   rtp_listen(struct rtp_sock **rsp, int proto, const struct sa *ip,
 		 rtp_recv_h *recvh, rtcp_recv_h *rtcph, void *arg);
 int   rtp_hdr_encode(struct mbuf *mb, const struct rtp_header *hdr);
 int   rtp_hdr_decode(struct rtp_header *hdr, struct mbuf *mb);
-int   rtp_encode(struct rtp_sock *rs, bool marker, uint8_t pt,
+int   rtp_encode(struct rtp_sock *rs, bool ext, bool marker, uint8_t pt,
 		 uint32_t ts, struct mbuf *mb);
 int   rtp_decode(struct rtp_sock *rs, struct mbuf *mb, struct rtp_header *hdr);
-int   rtp_send(struct rtp_sock *rs, const struct sa *dst,
+int   rtp_send(struct rtp_sock *rs, const struct sa *dst, bool ext,
 	       bool marker, uint8_t pt, uint32_t ts, struct mbuf *mb);
 int   rtp_debug(struct re_printf *pf, const struct rtp_sock *rs);
 void *rtp_sock(const struct rtp_sock *rs);
diff --git a/src/rtp/rtp.c b/src/rtp/rtp.c
index e5ff272..a2c7d5e 100644
--- a/src/rtp/rtp.c
+++ b/src/rtp/rtp.c
@@ -358,8 +358,8 @@ int rtp_listen(struct rtp_sock **rsp, int proto, const struct sa *ip,
  *
  * @note The buffer must have enough space for the RTP header
  */
-int rtp_encode(struct rtp_sock *rs, bool marker, uint8_t pt, uint32_t ts,
-	       struct mbuf *mb)
+int rtp_encode(struct rtp_sock *rs, bool ext, bool marker, uint8_t pt,
+	       uint32_t ts, struct mbuf *mb)
 {
 	struct rtp_header hdr;
 
@@ -368,7 +368,7 @@ int rtp_encode(struct rtp_sock *rs, bool marker, uint8_t pt, uint32_t ts,
 
 	hdr.ver  = RTP_VERSION;
 	hdr.pad  = false;
-	hdr.ext  = false;
+	hdr.ext  = ext;
 	hdr.cc   = 0;
 	hdr.m    = marker ? 1 : 0;
 	hdr.pt   = pt;
@@ -421,7 +421,7 @@ int rtp_decode(struct rtp_sock *rs, struct mbuf *mb,
  *
  * @return 0 for success, otherwise errorcode
  */
-int rtp_send(struct rtp_sock *rs, const struct sa *dst,
+int rtp_send(struct rtp_sock *rs, const struct sa *dst, bool ext,
 	     bool marker, uint8_t pt, uint32_t ts, struct mbuf *mb)
 {
 	size_t pos;
@@ -441,7 +441,7 @@ int rtp_send(struct rtp_sock *rs, const struct sa *dst,
 
 	pos = mb->pos;
 
-	err = rtp_encode(rs, marker, pt, ts, mb);
+	err = rtp_encode(rs, ext, marker, pt, ts, mb);
 	if (err)
 		return err;