chan_unistim: Fix code, causing all incoming DTMF sent back to asterisk

Current implementation of ast_channel_tech send_digit_begin hook uses
same function for tone playback as key press handler. This cause every
incoming dtmf send back to asterisk. In case of two unistim phones
connected to each other, it'll cause indefinite DTMF loop. Fix add
separate function for dtmf tone phone play.

Change-Id: I5795db468df552f0c89c7576b6b3858b26c4eab4

channels/chan_unistim.c

@@ -3332,22 +3332,12 @@ static void handle_call_incoming(struct unistimsession *s)
 	return;
 }
 
-static int unistim_do_senddigit(struct unistimsession *pte, char digit)
+static int send_dtmf_tone(struct unistimsession *pte, char digit)
 {
-	struct ast_frame f = { .frametype = AST_FRAME_DTMF, .subclass.integer = digit, .src = "unistim" };
-	struct unistim_subchannel *sub;
-        int row, col;
+	int row, col;
 
-	sub = get_sub(pte->device, SUB_REAL);
-	if (!sub || !sub->owner || sub->alreadygone) {
-		ast_log(LOG_WARNING, "Unable to find subchannel in dtmf senddigit\n");
-		return -1;
-	}
-
-	/* Send DTMF indication _before_ playing sounds */
-	ast_queue_frame(sub->owner, &f);
 	if (unistimdebug) {
-		ast_verb(0, "Send Digit %c (%i ms)\n", digit, pte->device->dtmfduration);
+		ast_verb(0, "Phone Play Digit %c\n", digit);
 	}
 	if (pte->device->dtmfduration > 0) {
 		row = (digit - '1') % 3;
@@ -3365,6 +3355,28 @@ static int unistim_do_senddigit(struct unistimsession *pte, char digit)
 		} else {
 			send_tone(pte, 500, 2000);
 		}
+	}
+	return 0;
+}
+
+static int unistim_do_senddigit(struct unistimsession *pte, char digit)
+{
+	struct ast_frame f = { .frametype = AST_FRAME_DTMF, .subclass.integer = digit, .src = "unistim" };
+	struct unistim_subchannel *sub;
+
+	sub = get_sub(pte->device, SUB_REAL);
+	if (!sub || !sub->owner || sub->alreadygone) {
+		ast_log(LOG_WARNING, "Unable to find subchannel in dtmf senddigit\n");
+		return -1;
+	}
+
+	/* Send DTMF indication _before_ playing sounds */
+	ast_queue_frame(sub->owner, &f);
+	if (pte->device->dtmfduration > 0) {
+		if (unistimdebug) {
+			ast_verb(0, "Send Digit %c (%i ms)\n", digit, pte->device->dtmfduration);
+		}
+		send_dtmf_tone(pte, digit);
 		usleep(pte->device->dtmfduration * 1000);	 /* XXX Less than perfect, blocking an important thread is not a good idea */
 		send_tone(pte, 0, 0);
 	}
@@ -5507,34 +5519,21 @@ static int unistim_senddigit_begin(struct ast_channel *ast, char digit)
 	if (!pte) {
 		return -1;
 	}
-	return unistim_do_senddigit(pte, digit);
+	return send_dtmf_tone(pte, digit);
 }
 
 static int unistim_senddigit_end(struct ast_channel *ast, char digit, unsigned int duration)
 {
 	struct unistimsession *pte = channel_to_session(ast);
-	struct ast_frame f = { 0, };
-	struct unistim_subchannel *sub;
-
-	sub = get_sub(pte->device, SUB_REAL);
 
-	if (!sub || !sub->owner || sub->alreadygone) {
-		ast_log(LOG_WARNING, "Unable to find subchannel in dtmf senddigit_end\n");
+	if (!pte) {
 		return -1;
 	}
 
 	if (unistimdebug) {
-		ast_verb(0, "Send Digit off %c\n", digit);
-	}
-	if (!pte) {
-		return -1;
+		ast_verb(0, "Send Digit off %c (duration %d)\n", digit, duration);
 	}
 	send_tone(pte, 0, 0);
-	f.frametype = AST_FRAME_DTMF;
-	f.subclass.integer = digit;
-	f.src = "unistim";
-	ast_queue_frame(sub->owner, &f);
-
 	return 0;
 }