Hi,
> I am very new to the Telecom world. I have a basic doubt. Why people
> are using the SS7 protocol instead of TCP/IP Stack.
"Because, that way, it will work."
That is a sufficiently obscure reference that some expansion is required --
The characteristics of the two systems are radically different -- especially with regard to latency, 'jitter', and congestion handling.
"non-real-time" (data) communications have different reqirements from "strict real-time" (voice) communications.
Different solutions for different needs.