What are the important functionalities of SS7? Explain their use.

Question

What will be an ideal response?

Answer 1

There are five major functionalities of SS7 as follows:
(a) Message Transfer Part (MTP): It has three levels. The first is Signaling
Data Link functions which de.ne the physical, electrical and functional
characteristics of the signaling link and physical interfaces. The second is
Signaling Link functions which define the functions and procedures to ensure
that message are reliably transmitted across a signaling link. The third is
Signaling Network function which define those transport functions and
procedures that are common to and independent of individual signaling links.
(b) Signaling Connection Control Part (SCCP): It provides additional functions
to the MTP, to support connectionless and connection oriented network
services and Global Title Translation (GIT). It deals with signaling connections
and also offers data transactions which occur without establishing a
connection.
(c) ISDN User Part (ISUP): It offers two types of services, basic and
supplementary. Basic services consist of those services employed in the
process of setting up and tearing down a call. Supplementary services consist
of those services of passing all messages that may be necessary to maintain
and/or modify the call.
(d) Transaction Capability Application Part (TCAP): The primary service
offered to an application is the packaging of data. TCAP is to format and
present data in various standardized formats which allows it to be used in
multi-vendor environments.
(e) Operations, Maintenance and Administration Part (OMAP) and ASE:
OMAP defines messages and protocols that assist the administration of SS7
networks. Application Service Element (ASE) is a module or portion of a
protocol in the application layer of the OSI protocol stack.