Indicates the tag number.
If ccmeEnabled object is 'true' for Cisco
CallManager Express Mode then this object
indicates the ephone-dn tag under which the
COR was configured.
If csrstEnabled object is 'true' for Cisco
Survivable Remote Site Telephony (SRST) mode,
then this object indicates the COR list
identifier configured under SRST configuration
or Voice Registrar configuration.