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Chapter 3 — DPNSS1/DASS2 features description and implementation Page 749 of 1536
— If the ISDN Call Connection Limitation (ICCL) feature is equipped,
when an ISDN call reaches the terminating Meridian 1 node, it returns
the Tandem Threshold count in the ALERT message to the originating
node. If an ISDN call encounters a DPNSS1 gateway while being
channeled, the complete tandem count is not known since DPNSS1 does
not pass this information back to the originating node. Therefore, the
ICCL Tandem Threshold count in the ALERT message passed from the
DPNSS1 gateway to the originating node is incorrect (the actual value
returned is that received at the gateway node, increased by one).
For the outgoing portion of a call, the gateway will use the received value
of the Loop Avoidance Supplementary Information String or Tandem
Count to adjust the Tandem Count or Loop Avoidance Limit
information.
— DPNSS1 operation will not support the following:
• ISDN Basic Rate Interface (BRI) sets
or
• ISDN BRI Numeris Terminals.
— When an incoming DPNSS1 call to a local station hunts across a
DPNSS1 trunk, the Loop Avoidance Limit will be used for the outgoing
call to avoid the possibility of a call looping continuously because of the
Call Hunt feature.
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