diff --git a/daemon/dtmf.c b/daemon/dtmf.c
index d73b9a0d16..3929f91daa 100644
--- a/daemon/dtmf.c
+++ b/daemon/dtmf.c
@@ -55,6 +55,9 @@ static void dtmf_bencode_and_notify(struct call_media *media, unsigned int event
 
 	bencode_dictionary_add_string_len(data, "callid", call->callid.s, call->callid.len);
 	bencode_dictionary_add_string_len(data, "source_tag", ml->tag.s, ml->tag.len);
+	if (ml->label.s) {
+		bencode_dictionary_add_string_len(data, "source_label", ml->label.s, ml->label.len);
+	}
 
 	GList *tag_values = g_hash_table_get_values(call->tags);
 	for (GList *tag_it = tag_values; tag_it; tag_it = tag_it->next) {
@@ -90,9 +93,11 @@ static GString *dtmf_json_print(struct call_media *media, unsigned int event, un
 	g_string_append_printf(buf, "{"
 			"\"callid\":\"" STR_FORMAT "\","
 			"\"source_tag\":\"" STR_FORMAT "\","
+			"\"source_label\":\"" STR_FORMAT "\","
 			"\"tags\":[",
 			STR_FMT(&call->callid),
-			STR_FMT(&ml->tag));
+			STR_FMT(&ml->tag),
+			STR_FMT(ml->label.s ? &ml->label : &STR_EMPTY));
 
 	GList *tag_values = g_hash_table_get_values(call->tags);
 	int i = 0;
diff --git a/t/test-transcode.c b/t/test-transcode.c
index 4a71bcfa05..c041ba574e 100644
--- a/t/test-transcode.c
+++ b/t/test-transcode.c
@@ -96,9 +96,11 @@ static void __start(const char *file, int line) {
 	g_queue_push_tail(&media_A->streams, ps_new(&call));
 	g_queue_push_tail(&media_B->streams, ps_new(&call));
 	str_init(&ml_A->tag, "tag_A");
+	str_init(&ml_A->label, "label_A");
 	media_A->monologue = ml_A;
 	media_A->protocol = &transport_protocols[PROTO_RTP_AVP];
 	str_init(&ml_B->tag, "tag_B");
+	str_init(&ml_B->label, "label_B");
 	media_B->monologue = ml_B;
 	media_B->protocol = &transport_protocols[PROTO_RTP_AVP];
 	__init();
@@ -786,7 +788,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	dtmf("");
@@ -802,7 +804,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80", 0);
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80", 0);
 	dtmf("");
@@ -835,7 +837,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	dtmf("");
@@ -851,7 +853,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80", 0);
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80", 0);
 	dtmf("");
@@ -883,7 +885,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	dtmf("");
@@ -899,7 +901,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80", 0);
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, 101, "\x05\x8a\x02\x80", 0);
 	dtmf("");
@@ -931,7 +933,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	dtmf("");
@@ -949,7 +951,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "", 0);
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "", 0);
 	dtmf("");
@@ -996,7 +998,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	dtmf("");
@@ -1014,7 +1016,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "", 0);
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "", 0);
 	dtmf("");
@@ -1060,7 +1062,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":8,\"duration\":100,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	packet_seq_exp(A, 101, "\x08\x8a\x03\x20", 1000160, 205, 101, "\x08\x8a\x03\x20", 0);
 	dtmf("");
@@ -1078,7 +1080,7 @@ int main(void) {
 	dtmf("");
 	// end
 	packet_seq(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "");
-	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
+	dtmf("{\"callid\":\"test-call\",\"source_tag\":\"tag_A\",\"source_label\":\"label_A\",\"tags\":[],\"type\":\"DTMF\",\"timestamp\":0,\"source_ip\":\"\",\"event\":5,\"duration\":80,\"volume\":10}");
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "", 0);
 	packet_seq_exp(A, 101, "\x05\x8a\x02\x80", 1001280, 211, -1, "", 0);
 	dtmf("");