Question

What is meant by protocol discriminator.

Answer 1

The protocol discriminator is the first part of every message. The protocol discriminator is coded according to Table 4-1.

Answer 2

Answer:

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The purpose of the protocol discriminator is to distinguish messages for user-network call control from other messages(to be defined). It also distinguishes messages of this Standard from those OSI network layer protocol units which are códed to other CCITT Recommendations and other standards.