What is GTT

GTT - Global Title Translation

First of all what is GT (Global Title)
*Global Title* (GT) is an *address* used in the *SCCP* protocol for routing signaling messages on telecommunications networks. In theory, a global title is a unique address which refers to only one destination, though in practice destinations can change over time.

OR

The routing address within an ISDN network is termed the point code. Global titles identify end terminals that may be beyond the ISDN network. To route information the Global Title is translated into a point code, this is typically conducted at a STP (Signalling Transfer Point).

GTT can also be defined in terms of routing as SCCP routing,

I mean for SCCP routing we usually requires GTT not only to STP but also to Switch that supports SS7 protocol, e.g.

In any MSU (a Signal Unit or data in SS7 n/w) if we have an OPC as well as DPC then we don't need to find out SSN for the destine node (that mean the STP will not manipulate the data its receiving from the Originating node it will simply route the data in the format in which it was receiving (this is called MTP routing that we usually don't perform) while in case of SCCP routing we do have an idea about only OPC not about DPC, to find out DPC we extract the some other parameters such as SSN, NAI, NP, and TT from the MSU (this all parameters comes under SCCP part of SS7 architecture (This is called SCCP routing).

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