TC Systems, Inc. South Carolina - AT&T Clec Online

6/23/04
Attachment 3
Page 27
systems and databases (DBs), TC SYTEMS local or tandem switching systems and
other third-party switching systems directly connected to BellSouth SS7 network.
LEC
Local or
Tandem
Switch
AT&T
Local or
Tandem
Switch
LEC
STPs
LEC
DBs
B
LEC STPs
SS7 Network Interconnection
LEC
STPs
AT&T
STPs
CLEC
Local or
Tandem
Switch
FIGURE 1. SS7 NETWORK INTERCONNECTION
7.2 SS7 Network Interconnection shall provide connectivity to all components of the
BellSouth SS7 network. These include:
7.2.1 BellSouth local or tandem switching systems;
7.2.2 BellSouth DBs; and
7.2.3 Other third-party local or tandem switching systems.
7.3 The connectivity provided by SS7 Network Interconnection shall fully support the
functions of BellSouth switching systems and DBs and TC SYTEMS or other thirdparty
switching systems with direct access to the BellSouth SS7 network.
7.4 In particular Figure 2 depicts a circumstance where SS7 Network Interconnection
shall provide transport for certain types of TCAP messages. If traffic is routed based
on dialed or translated digits between an TC SYTEMS local switching system and a
BellSouth or other third-party local switching system, either directly or via a
BellSouth tandem switching system, then it is a requirement that the BellSouth SS7
network convey via SS7 Network Interconnection the TCAP messages that are
necessary to provide Call Management services (Automatic callback, Automatic
Recall, and Screening List Editing) between the TC SYTEMS local STPs and the
BellSouth or other third-party local switch -- assuming that there is a written
agreement between TC SYTEMS and the third-party local switch.
CCCS 203 of 433