I have scenario where I have primary connectivity to service provider via serial interface and serial interface is configured with the backup interface on it. We have ISDN backup connectivity on that router to back up the serial interface. On the same router we have HSRP configured with the tracking of serial interface. So my question is if my serial interface will go down then it will fire the ISDN connectivity but what will be the status of my HSRP? will this router remain as a active or will turn to Standby if serial goes down and ISDN fired up?