diff --git a/daemon/call.c b/daemon/call.c
index 5ff820381..44d69b17c 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -670,6 +670,9 @@ static struct rtp_extension *call_media_ext_lookup_ht(struct call_media *m, unsi
 
 static const struct extmap_ops extmap_ops_short = {
 	.lookup = call_media_ext_lookup_array,
+	.length = extmap_length_short,
+	.header = extmap_header_short,
+	.print = extmap_print_short,
 };
 static const struct extmap_ops extmap_ops_long = {
 	.lookup = call_media_ext_lookup_ht,
diff --git a/daemon/media_socket.c b/daemon/media_socket.c
index dd835cfc5..64edcbfbf 100644
--- a/daemon/media_socket.c
+++ b/daemon/media_socket.c
@@ -2079,6 +2079,52 @@ const struct rtpext_printer rtpext_printer_copy = {
 
 
 
+static bool extmap_short_is_valid(const struct rtp_extension_data *ext) {
+	// valid ranges for short form?
+	if (ext->ext->id <= 0 || ext->ext->id >= 15)
+		return false;
+	if (ext->content.len > 16)
+		return false;
+	return true;
+}
+
+size_t extmap_length_short(const struct media_packet *mp) {
+	const extmap_data_q *q = &mp->extmap;
+
+	size_t ret = 4; // 0xbede + int16 length
+	for (__auto_type l = q->head; l; l = l->next) {
+		__auto_type ext = l->data;
+		if (!extmap_short_is_valid(ext)) {
+			ilog(LOG_WARN | LOG_FLAG_LIMIT, "RTP extension with id %d length %zu not valid "
+					"for short form", ext->ext->id, ext->content.len);
+			continue;
+		}
+		ret++; // 1-byte header
+		ret += ext->content.len;
+	}
+
+	return ret;
+}
+
+void extmap_header_short(void *_dst) {
+	unsigned char *dst = _dst;
+	dst[0] = 0xbe;
+	dst[1] = 0xde;
+}
+
+size_t extmap_print_short(void *_dst, const struct rtp_extension_data *ext) {
+	unsigned char *dst = _dst;
+
+	if (!extmap_short_is_valid(ext))
+		return 0;
+
+	dst[0] = (ext->ext->id << 4) | (ext->content.len - 1);
+	memcpy(dst + 1, ext->content.s, ext->content.len);
+	return ext->content.len + 1;
+}
+
+
+
 // `out_media` can be NULL XXX streamline this to remove this exception
 const struct streamhandler *determine_handler(const struct transport_protocol *in_proto,
 		struct call_media *out_media, bool must_recrypt)
diff --git a/include/call.h b/include/call.h
index 316ec91b5..dce3cbdaa 100644
--- a/include/call.h
+++ b/include/call.h
@@ -466,6 +466,10 @@ INLINE int64_t packet_stream_last_packet(const struct packet_stream *ps) {
 
 struct extmap_ops {
 	struct rtp_extension	*(*lookup)(struct call_media *, unsigned int);
+
+	size_t			(*length)(const struct media_packet *);
+	void			(*header)(void *dst);
+	size_t			(*print)(void *dst, const struct rtp_extension_data *);
 };
 
 
diff --git a/include/media_socket.h b/include/media_socket.h
index 074f0f847..d35b63aa7 100644
--- a/include/media_socket.h
+++ b/include/media_socket.h
@@ -325,6 +325,11 @@ TYPED_GQUEUE(extmap, struct rtp_extension);
 TYPED_GHASHTABLE(extmap_ht, void, struct rtp_extension, g_direct_hash, g_direct_equal, NULL, NULL);
 TYPED_GHASHTABLE(ext_name_ht, str, struct rtp_extension, str_hash, str_equal, NULL, NULL);
 
+size_t extmap_length_short(const struct media_packet *);
+void extmap_header_short(void *);
+size_t extmap_print_short(void *, const struct rtp_extension_data *);
+
+
 
 extern local_intf_q all_local_interfaces; // read-only during runtime