MT#59038 support `block DTMF` flag

Change-Id: I6426798708d4dfb73253236ffdc0030e85494efd

daemon/call_interfaces.c

@@ -1015,6 +1015,10 @@ static void call_ng_flags_flags(sdp_ng_flags *out, str *s, helper_arg dummy) {
 		case CSH_LOOKUP("player"):
 			out->audio_player = AP_TRANSCODING;
 			break;
+		case CSH_LOOKUP("block-dtmf"):
+		case CSH_LOOKUP("block-DTMF"):
+			out->block_dtmf = 1;
+			break;
 		case CSH_LOOKUP("block-short"):
 		case CSH_LOOKUP("block-shorts"):
 		case CSH_LOOKUP("block-short-packets"):
@@ -2162,6 +2166,9 @@ static const char *call_offer_answer_ng(ng_buffer *ngbuf, bencode_item_t *input,
 		CALL_CLEAR(call, DROP_TRAFFIC);
 	}
 
+	if (flags.block_dtmf)
+		call_set_dtmf_block(call, monologues[0], &flags);
+
 	ret = monologue_offer_answer(monologues, &streams, &flags);
 	if (!ret)
 		ret = sdp_replace(chopper, &parsed, to_ml, &flags);

docs/ng_control_protocol.md

@@ -815,6 +815,12 @@ Spaces in each string may be replaced by hyphens.
 	Corresponds to the *rtpproxy* `a` flag. Advertises an RTP endpoint which uses asymmetric
 	RTP, which disables learning of endpoint addresses (see below).
 
+* `block DTMF`
+
+    Useful in `offer` or `answer` messages to immdiately enable DTMF blocking
+    (or other DTMF security mechanism) for the relevant call party, identical
+    to using a `block DTMF` message for the call party immediately after.
+
 * `block short` or `block short packets`
 
     Enables blocking of short RTP packets for the applicable call participant.

include/call_interfaces.h

@@ -183,6 +183,7 @@ struct sdp_ng_flags {
 		     accept_any:1,
 	             inject_dtmf:1,
 		     detect_dtmf:1,
+		     block_dtmf:1,
 	             t38_decode:1,
 	             t38_force:1,
 	             t38_stop:1,