diff --git a/daemon/call.c b/daemon/call.c
index 458ac2988..682a8cd02 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -2937,6 +2937,8 @@ static void media_init_extmap(struct call_media *media, struct rtp_extension *ex
 	t_hash_table_insert(media->ext_name_ht, &ext->name, ext);
 	t_hash_table_insert(media->extmap_ht, GUINT_TO_POINTER(ext->id), ext);
 
+	ext->handler = rtp_extension_get_handler(&ext->name);
+
 	if (ext->id > 0 && ext->id <= 14)
 		media->extmap_a[ext->id - 1] = ext;
 	else
diff --git a/daemon/media_socket.c b/daemon/media_socket.c
index df432bc44..8d1df682f 100644
--- a/daemon/media_socket.c
+++ b/daemon/media_socket.c
@@ -2668,6 +2668,25 @@ static void media_packet_rtcp_mux(struct packet_handler_ctx *phc, struct sink_ha
 }
 
 
+static void rtp_ext_mid_parse(struct packet_handler_ctx *phc, const struct rtp_extension_data *data) {
+	__auto_type media = t_hash_table_lookup(phc->mp.media->monologue->media_ids, &data->content);
+	if (!media)
+		return; // XXX log error?
+
+	media_packet_reset_media(phc, media);
+}
+
+static const rtp_ext_handler rtp_ext_mid = {
+	.parse = rtp_ext_mid_parse,
+	.id = RTP_EXT_MID,
+};
+
+rtp_ext_handler rtp_extension_get_handler(const str *name) {
+	if (!str_cmp(name, "urn:ietf:params:rtp-hdrext:sdes:mid"))
+		return rtp_ext_mid;
+	return (rtp_ext_handler) { .id = RTP_EXT_UNKNOWN };
+}
+
 static void media_packet_rtp_extension(struct packet_handler_ctx *phc, unsigned int id, const str *data) {
 	__auto_type ext = phc->mp.media->extmap_ops->lookup(phc->mp.media, id);
 	if (!ext)
@@ -2679,6 +2698,9 @@ static void media_packet_rtp_extension(struct packet_handler_ctx *phc, unsigned
 	edata->content = *data;
 
 	t_queue_push_tail_link(&phc->mp.extmap, &edata->link);
+
+	if (ext->handler.parse)
+		ext->handler.parse(phc, edata);
 }
 
 static void media_packet_rtp_extensions(struct packet_handler_ctx *phc) {
diff --git a/include/media_socket.h b/include/media_socket.h
index c1587697f..888ec4636 100644
--- a/include/media_socket.h
+++ b/include/media_socket.h
@@ -305,9 +305,30 @@ struct media_packet {
 	int ptime; // returned from decoding
 };
 
+struct packet_handler_ctx;
+
+
+struct rtp_extension;
+
+typedef struct {
+	void (*parse)(struct packet_handler_ctx *, const struct rtp_extension_data *);
+
+	ssize_t (*len)(struct call_media *);
+	ssize_t (*print)(void *dst, struct rtp_extension *, struct call_media *);
+
+	enum {
+		RTP_EXT_MID = 0,
+
+		RTP_EXT_NUM,
+
+		RTP_EXT_UNKNOWN,
+	} id;
+} rtp_ext_handler;
+
 struct rtp_extension {
 	unsigned int id;
 	str name; // urn:ietf:params:rtp- hdrext:... or URI
+	rtp_ext_handler handler;
 	bool accepted:1;
 };
 
@@ -337,6 +358,8 @@ void extmap_header_long(void *);
 size_t extmap_print_long(void *, const struct rtp_extension_data *);
 
 
+rtp_ext_handler rtp_extension_get_handler(const str *);
+
 
 extern local_intf_q all_local_interfaces; // read-only during runtime