Description: Tells you the corresponding channel that is used if a resource module connection is up. If this is indexed by a Resource Module it will return the ISDN channel used or the Resource Module used if this is a BRI or PRI/DUAL Pri. Note: A return of 0 means that any active call does not include a resource module. Also, there is the possiblility of 64 channels on a card, therefore to find the corresponding channel on numbers returned that are greater than 64, use the following logic: channel is on card X / 64 and is channel X mod 64.