What is a Global Title?

A Global Title (GT) is an address used in the SCCP protocol for routing signaling messages on various telecommunications networks.

Global titles are unique addresses that refer to only one destination, but in practice, those destinations can change over a given time frame.

GT title structure is defined by the ITU-T signaling connection control part formats and codes recommendation (Q.713), further extended in the supporting numbering plan standards. Other national variants of the Signaling Connection Control Part (SCCP) define their format for the Global Title. The value of a Global Title is a sequence of attributes that modify the address value. The length of a Global Title Address is from 1 to 21 digits and works within SS7 (Signaling Number 7) for routing messages.

Global Title routes call from one network to another. When placing a call, the Global Title identifies the destination network and specific location within the network. Then, the call routes through the SS7 network to the destination network, and the call is connected. It also enables services such as number portability and international roaming.

Global Title Leasing is a practice where service providers lease access to Global Titles and Hosts to businesses.