Lucent Technologies 8.2 User Manual

Page of 1707
DEFINITY ECS Release 8.2
Administrator’s Guide  
555-233-506  
Issue 1
April 2000
Features and technical reference 
1280
Call Forwarding 
20
If the Coverage of Calls Redirected Off-Net field on the System Parameters 
Customer-Options screen and the Coverage of Calls Redirected Off-Net Enabled 
field on the System Parameters - Call Coverage/Call Forwarding screen are both 
set to 
y
, the system allows calls forwarded off-net to be monitored for busy or 
no-answer conditions. The system may bring the call back for call-coverage 
processing if the principal’s coverage criteria are satisfied at the forwarded-to 
destination. However, if the principal does not have a coverage path, the system 
does not monitor the call. It is left at the off-net destination regardless of whether 
it is answered or busy.
Calls forwarding off net require an available outgoing trunk. Additionally, when 
the Coverage of Calls Redirected Off-Net field is 
y
, a call-classifier port may be 
required. If there are no call-classifier ports available when needed, the call still 
routes off net, but it is not monitored for call progress tones and cannot be 
returned to the switch for further call coverage processing.
Whenever an incoming trunk call is redirected off-net, a timer is set that precludes 
any other incoming trunk call from redirecting off-net until the timer either 
expires or is cancelled. The rationale for this mechanism is to prevent calls that 
were redirected off-net from being re-routed back to the original principal from 
the off-net destination, effectively creating a round-robin loop that continuously 
seizes trunks until they are exhausted. The blocked call receives busy tone or 
redirects to coverage.
NOTE:
If you send calls off-net and use the Call Classifier - Detector or the 
Tone-Clock (with Call Classifier-Tone Detector) circuit pack (the 
international version) for call classification and do not use the American 
tone plan, use the System-Parameters Country-Options screen to define 
specific country tones. If you use the Call Classifier - Detector or the 
Tone-Clock (with Call Classifier-Tone Detector) circuit pack (the 
international version) and do not use the System-Parameters 
Country-Options screen, your system will download the American tone plan 
regardless of your geographical location.
Call Forwarding — Override
You can administer Call Forwarding Override on a system-wide basis to allow a 
forwarded-to party to override Call Forwarding when placing a call to the 
forwarded-from party. Call Forwarding Override is invoked automatically if the 
system-wide override option is set.
Call Forwarding Override cannot be used when calls forward to an external 
number. Call Forwarding All Calls from a data user or a hunt group cannot be 
overridden with Call Forwarding Override.