SS7 is a
protocol used by the
telecommunications industry for
out of band signaling. It provides fault-tolerant access to many
services that are used every time a
phone call is placed. These
services include:
ISUP,
CLASS,
CNAM,
E800,
LNP,
AIN,
IS41, and
LIDB. A typical american
network is arranged with a particular
switch or
SSP linked to one or more pairs of
STPs which are also linked to each other. These
STPs are then linked to other
SSPs,
STPs, and
SCPs.
I forgot to mention that the
services are divided into two catagories;
ISUP and
TCAP.
ISUP is
call completion, and
TCAP is everything else.