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QSIG
361
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
B Private Networking
QSIG Basic Call Setup
Transit Counter
(ANF–TC)
DEFINITY ECS provides QSIG ANF-TC as defined in ISO/IEC 6B032 and 6B033.
It prevents indefinite looping, connections giving poor transmission performance, and
inefficient use of network resources.
ANF-TC is invoked automatically for ISDN basic calls and the Route Pattern form
indicates the number of switches through which a call may be routed.
QSIG Basic Supplementary Services
Called/Busy Name Enables the calling party to see the name of the called party at the following times:
• while the call is ringing at the called party’s terminal.
• while listening to a busy tone because the called party’s terminal was busy.
Called/Busy Name is similar to the display provided for local on-switch calls, as well
as for the DCS calls, with the following exceptions:
• Names longer than 15 characters are truncated; only the first 15 characters display.
• The number does not display unless QSIG VALU is enabled.
QSIG Name and
Number Identification
QSIG Name and Number Identification allows a switch to send and receive the
calling number, calling name, connected number, and connected name. QSIG Name
and Number Identification displays up to 15 characters for the calling and connected
name and up to 15 digits for the calling and connected number across ISDN
interfaces.
You can administer outgoing calls as “yes”, “no”, or “restricted.” Restricted means
that DEFINITY ECS sends the information but sends it “presentation restricted,”
which indicates to the receiving switch that the information should not be displayed.
A received restricted number is included on the Call Detail Record (CDR).
Transit switch information
When DEFINITY ECS acts as a transit switch, the QSIG standards require it to pass
on all supplementary service information that is not addressed to it. This includes
name information. (A “transit” switch is a switch that routes an incoming call
administered for Supplementary Services Protocol Bto a trunk also administered for
Supplementary Services Protocol B.) However, Basic Call Setup and number
information is subject to modification by the transit switch. This means that trunk
group administration on a transit switch does not override incoming name
information, but may override incoming number information (as long as this does not
lower the restriction on the information).
Example
If a non-restricted calling name and number are received by a DEFINITY ECS acting
as a transit switch, and if the outgoing trunk is administered for presentation restricted
for both name and number, the number is passed on as “restricted” and name is
passed on as “unrestricted.”