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INTER-TEL
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CS-5200/5400 ADMINISTRATOR GUIDE, ISSUE 1.1 – August 2005
Page 38 Trunk Programming
Trunk Programming
The trunk information that can be programmed by an Administrator phone includes the follow-
ing:
Individual trunks:
• Answer Supervision type: Answer Supervision determines whether the system should
consider a call valid when it receives polarity reversal from the central office or wait for
the Valid Call timer to expire. Any outside call put on hold becomes valid immediately,
regardless of Answer Supervision or Valid Call timer status. There are three options
available under Answer Supervision type:
— Polarity Reversal: A loop reversal must be received to consider the call valid.
When the first loop reversal is received, the call is made valid immediately, and
the Inter-Tel phone display will begin call cost. When a second loop reversal is
received, the system will terminate the call.
— Valid Call Timer: After the Valid Call Timer expires, the call is validated. All
polarity reversals received before and after the Valid Call Timer are ignored.
— Valid Call Timer with Polarity Reversal: If a loop reversal is received before
the Valid Call Timer expires, the call will be made valid immediately, and the
Inter-Tel phone display will begin call cost. When a second loop reversal is
received, the system will terminate the call. If a loop reversal is not received
before the Valid Call Timer expires, the call will be made valid by the timer. If a
loop reversal is received after the timer expires, the loop reversal is ignored, but
the call cost is reset. If a second loop reversal is then received, the system will ter-
minate the call.
• Caller ID: When selected, the Caller ID option indicates that the associated trunk will
provide caller identification signals. This capability can be programmed because of the
Advanced CO Interfaces feature that is included in your software license.
• Hybrid balance: Hybrid balance can be set to Normal or Short to allow the installer to
adjust the hybrid impedance of the trunk based on local central office conditions.
• Short: The short balance is used when trunks are supplied by other equipment located
within the same building, using private, copper wire termination (e.g., an OPX supplied
by another PBX that does not use the public network) or when the site is located close
to the central office.
• Normal: The normal balance can be used by most trunks.
• DTMF or dial pulse signaling: Trunks can be set for DTMF or dial pulse signals.
• Trunk group assignment: Trunks can be assigned to trunk groups on an individual
basis.
• Busy trunk: This feature allows you to temporarily remove a trunk from service. While
the trunk is out of service, it cannot be used for placing outgoing calls. However,
incoming calls on analog trunks will ring in and can be answered. Incoming calls on
ISDN trunks cannot be answered. The trunk will remain out of service until the Trunk
Busy Out timer expires or you place the trunk back in service.
NOTE
If a second loop reversal is not received, the system will not terminate
the call unless the inside party hangs up or loss-of-loop is received
from the telephone company.
NOTE
If a second loop reversal is not received, the system will not terminate
the call unless the inside party hangs up or loss-of-loop is received
from the telephone company.