A Service Provider Gateway is a provisioning gateway in a telecom

Telecommunication

Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...

s' network used as part of Wholesale Line Rental

Wholesale line rental

Wholesale Line Rental is a service in which a telecommunication operator takes control of all the connections made through a telephone line from the native operator and collects the subscription fee from the subscribers....

 to allow telecoms operators to control provisioning on the Openreach network.

SPG as it is more commonly referred to has the ability to check an address for a standard BT

BT Group

BT Group plc is a global telecommunications services company headquartered in London, United Kingdom. It is one of the largest telecommunications services companies in the world and has operations in more than 170 countries. Through its BT Global Services division it is a major supplier of...

 line and then the agent using the system can order a new BT line, order the start of a stopped BT line, if required by the customer.

SPG cannot detect Virgin Media

Virgin Media

Virgin Media Inc. is a company which provides fixed and mobile telephone, television and broadband internet services to businesses and consumers in the United Kingdom...

 lines, or lines that are on an LLU (or Local-loop unbundling) network such as TalkTalk

TalkTalk

TalkTalk is a pay television, telecommunications and internet service provider company headquartered in London, United Kingdom...

, tiscali

Tiscali

Tiscali may refer to:*Tiscali, an archaeological village of Nuragici people, in Sardinia, Italy, notable because it was completely inside a huge cavern*Tiscali SpA, a telecom company based in Italy*Tiscali TV , multiple uses...

, or British Sky Broadcasting

British Sky Broadcasting

British Sky Broadcasting Group plc is a satellite broadcasting, broadband and telephony services company headquartered in London, United Kingdom, with operations in the United Kingdom and the Ireland....

.