Correction of #5679 for incoming call

net/asterisk/files/iopsys/lib/voice/config_asterisk.sh

@@ -802,12 +802,11 @@ configure_extensions() {
 	else
 		sed -i "s/|HOWLER_TIMEOUT|/$howler_timeout/"			$WORK_DIR/extensions.conf
 	fi
-	if [ -n "$internal_service" -a "$internal_service" = "1" ] ; then
-		if [ -n "$callforward_enabled" -a "$callforward_enabled" = "1" ] ; then
-			sed -i "s/|INCOMING_HANDLER|/Macro(callhandler,\${CHANNEL(endpoint)})/"	$WORK_DIR/extensions.conf
-		else
-			sed -i "s/|INCOMING_HANDLER|/Goto(call_line,\${EXTEN},1))/"		$WORK_DIR/extensions.conf
-		fi
+
+	if [ -n "$internal_service" -a "$internal_service" = "1" -a \( -n "$callforward_enabled" -a "$callforward_enabled" = "1" \) ] ; then
+		sed -i "s/|INCOMING_HANDLER|/Macro(callhandler,\${CHANNEL(endpoint)})/"	$WORK_DIR/extensions.conf
+	else
+		sed -i "s/|INCOMING_HANDLER|/Goto(call_line,\${EXTEN},1))/"		$WORK_DIR/extensions.conf
 	fi
 
 	if [ -n "$extension_all_ports" ] ; then