Search the various Web sites and find why IS-41 message transfer employs X.25.

Question

What will be an ideal response?

Answer 1

TIA IS-41 is an Inter/Intra Cellular Network Communication Protocol which
was developed to support interoperability between differing cellular networks.
The protocol provides functionalities for automatic roaming, specifically roamer
validation, call delivery, feature portability, adjacent market handoff,
continuous subscriber service, and feature transparency. X.25 is the primary
method readily available in the early stages of IS-41 deployment since it has
low complexity. X.25 make the packet switch separate from the message
content. An X.25 network transfers data via packet switching. With this method,
information is taken from many different users and combined into discrete data
packets. These data packets are then forwarded to the Packet Data Network
(PDN).
SS7, Signaling System Number 7, is the backbone of the IS-41 intersystem
operations network for AMPS based networks in North America and around the
world. It provides interconnect among most cellular carriers, and is being used
extensively in PCS systems. Routing in an SS7 network can be based on either
the physical address of a network element (point code) or on a global title
translation. In this later case, a phone number, credit card number or other
logical address is used as routing information. The capabilities of packet
switching and flexible addressing make SS7 most suitable for
telecommunication networks. The only drawback is the cost of interconnection,
and for this (and some historical) reasons, some smaller carriers will continue to
interface to IS-41 networks using X.25, relying on protocol conversion to access
the SS7 backbone network.