Nortel TFC002 Manual page 21

Feature description Page 13 of 64
If the calling party wishes to continue waiting, the CAS attendant at the Main
location releases. Disconnect is detected at the Remote site, and the RLT
connection is removed. Further timed recalls cause the preceding process to
be repeated until either the called telephone answers or the calling party
disconnects.
When the Remote location is arranged for direct inward dialing (DID) and the
called telephone is arranged to forward calls to the attendant on no answer,
the call is treated as in the first two examples given in this section.
Centralized Attendant Service Description and engineering