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13-22 ETSI PRI
Long call disconnect
Calls that remain in an unanswered state are monitored. If the call is
unanswered for the period of time specified, the call is disconnected. To use
this feature, enable the LCDDUR option for ETSI PRI trunks and specify a
period of time in the TRKGRP option.
Non-standard routing
DDD/IDDD calls may prefix an NNNN when routing through the remote
point of presence to the public switched network. The maximum number of
digits for non-standard routing is 24.
Class of service screening
Class of service screening determines whether originating and terminating
types of trunks can be connected to each other based on their class of
service. Trunk group class of service screening is performed on all ETSI PRI
calls (regardless of whether ISA direct routing is performed).
Test calls/automatic trunk routing
Testline calls can be made over ETSI PRI trunks by using automatic trunk
routining (ATR), automatic trunk testing (ATT), and the manual level of
trunk test position (TTP) as currently used for ANSI PRI. For ATR test calls,
an additional PM type of 3 is added to indicate termination to a PDTC
instead of a DTCI.
Trunk group class-of-service screening
Trunk group class-of-service screening is performed on all ETSI PRI calls,
regardless of whether ISA direct routing is performed.
ETSI PRI trunks that allow class of service screening have the class of
service option in table CALLATTR set to an index datafilled in table COS
(class of service). Table COS is a two-dimensional matrix indexed by the
COS value of the incoming and outgoing trunk groups. A "Y" in table COS
allows calls to go through. "N" causes the call to attempt to route advance. If
a route advance is not successful, a GNCT occurs. "N" in table COS
generates a log based on the office parameter GEN_COSBLOCK_LOG in
either case.
Data calls
A call that originates over a PRI facility must terminate over a facility that
allows data to be transmitted if it has one of the following:
297-2521-106 Standard 23.01 March 2001
a BC information element of 64 kbit/s (restricted or unrestricted)
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