Number Translation services in association with number presentation services allow organisations to present their Non-Geographic numbers to end users in order to mask the true geographic location of their offices.
Currently, only a single number can be presented using traditional telecoms network such as BT number presentation services. With the advent of SIP trunking this situation is now vastly improved to provide multiple as opposed to single Non-Geographic numbers from a single location.
BT ISDN30e uses the Q.931 signalling system which is ratified to the International Telecommunications Union (ITU-T) standard. With SIP (Session Initiation Protocol) trunks, (a new communication signalling protocol for voice and data sessions), it is possible to replace expensive ISDN circuits and transmit multiple 03 Numbers from a single location, thereby giving rise to more flexible ways of working, especially for outbound calling operations which manage multiple campaigns at any one time e.g. for debt management and outbound telemarketing campaigns.
One of the main limitations of using 03 numbers in an outbound contact centre environment is that traditional Public Switched Telephone Network (PSTN) lines such as Analogue, BT ISDN2e and BT ISDN30e services only allow a single non-geographic number to be transmitted from the building, known as the primary bearer number.
The Caller Line I.D. (CLI) presented to the end user is therefore either the local fixed geographic number or an associated single 03 number. It is known that inbound telephone calls being received to a variety of locations, either multiple Direct Dial Inwards (DDIs) number within the same building or a separate building using traditional Time Division Multiplexing (TDM) technologies such as ISDN circuits, but it is this outbound call flexibility that puts SIP apart from traditional ISDN services.
The BT number presentation service allows organisations to mask the true location of the outbound call, allowing companies to house their operations overseas or in low labour cost areas where government assistance may be available. Traditionally, the number that is provided comes from the BT local exchange and is fixed, geographically. With SIP protocol, the link with geography is broken and it now allows location independence and more flexible ways of transmitting telephone numbers from a single location.