Enqueue AST_CONTROL_PROGRESS after AST_CONTROL_RINGING when MFC-R2 calls are accepted

(closes issue #18438)
Reported by: mariner7
Tested by: moy


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@299493 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -1189,6 +1189,7 @@ struct dahdi_pvt {
 	int mfcr2_dnis_matched:1;
 	int mfcr2_call_accepted:1;
 	int mfcr2_accept_on_offer:1;
+	int mfcr2_progress_sent:1;
 #endif
 	/*! \brief DTMF digit in progress.  0 when no digit in progress. */
 	char begindigit;
@@ -5331,6 +5332,8 @@ static int dahdi_call(struct ast_channel *ast, char *rdest, int timeout)
 			ast_log(LOG_ERROR, "unable to make new MFC/R2 call!\n");
 			return -1;
 		}
+		p->mfcr2_call_accepted = 0;
+		p->mfcr2_progress_sent = 0;
 		ast_setstate(ast, AST_STATE_DIALING);
 	}
 #endif /* HAVE_OPENR2 */
@@ -8708,6 +8711,18 @@ static struct ast_frame *dahdi_read(struct ast_channel *ast)
 #ifdef HAVE_OPENR2
 	if (p->mfcr2) {
 		openr2_chan_process_event(p->r2chan);
+		if (OR2_DIR_FORWARD == openr2_chan_get_direction(p->r2chan)) {
+			struct ast_frame fr = { AST_FRAME_CONTROL, { AST_CONTROL_PROGRESS } };
+			/* if the call is already accepted and we already delivered AST_CONTROL_RINGING
+			 * now enqueue a progress frame to bridge the media up */
+			if (p->mfcr2_call_accepted &&
+				!p->mfcr2_progress_sent && 
+				ast->_state == AST_STATE_RINGING) {
+				ast_log(LOG_DEBUG, "Enqueuing progress frame after R2 accept in chan %d\n", p->channel);
+				ast_queue_frame(p->owner, &fr);
+				p->mfcr2_progress_sent = 1;
+			}
+		}
 	}
 #endif