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To: Stitch who wrote (102)	4/5/1998 5:49:00 PM
From: Doug R	Read Replies (2) \| Respond to of 468

Stitch, Here's a brief explanation: SS7 - Signaling System 7 An addressing protocol that speeds up call processing by operating out of band. Includes fraud detection, caller ID, store and forward, ring back, concurrent data, etc. Y'know, just internet and telecom stuff. This is a decent resource: wcom.com Here's a longer explanation: SIGNALLING SYSTEMS and SS7 Definition: Signalling systems are used send telephone network specific information over a telephone network between call switching centres. Signalling System 7 is a protocol suite used for communication with, and control of, telephone switches and their attached processors. Description: In recent years the telecommunications companies have marketed new telephony services such as caller ID, call blocking, and call forwarding. The availability of these services marks a fundamental change in the mechanisms which manage the underlying telecommunications infrastructure. The original public switched telephone network consisted solely of wires that carried conversation. Switching instructions created by dialling a telephone number were carried along the same channel as voice signals. This type of signalling was described as 'in-band'. In the late 1970's a technique called 'out of band' signalling was developed and deployed. Out of band signalling uses a separate data line to carry switching instructions between switching centres. Telephone switching computers used the out of band data lines in order to check whether a telephone line was able to receive a call before switching a connection to the local loop, rather than perform the switching and then find a busy line. Out of band signal systems were enhanced and further developed to enable information to be sent to specific locations in a telephone network and send small amounts of a data line via the local loop. Protocols were developed in order to govern the communications process between switching centres, the most important of which in digital communications is Signalling System 7. Signalling System 7 (SS7) integrates the public switched telephone networks and computers for switching purposes and enables the use of telephone network computer databases to develop an intelligent network. SS7 is implemented upon packet switched digital telephone networks and is used over a signalling system operating at 56 kb/s. Information held in the databases is used to control the switching of calls and transfer of messages through the system SS7 has enabled a number of new services including call forwarding, call blocking, and Caller ID. Application: Signalling systems provide the basis for intelligent control of telecommunications networks. Protocols such as SS7 provide the formal basis which governs information exchange between switching centres. The combination enables the development of new services such as: SS7 transmits the number of the calling party, which can then be matched up on a database with the location of the telephone. This enables emergency service operators (UK 999, mainland Europe 911 calls) to know the location of a caller instantly as the call is answered. Companies can use the telephone number provided by the intelligent network to automatically pull up the associated records with that number from databases. Finance and home banking services increasingly use this service to validate customer identities and perform credit checks. Caller ID as marketed to consumers uses the information from SS7 to display the calling parties number or name if hooked up to a database. SS7 enabled the development of personal numbering where a person can have one telephone number for life. As the user moves from, one location to another they register a new line number where they can receive calls. As people call that telephone subscribers number an SS7 enabled database will be used to find the necessary information to switch the call to which ever line number has been supplied. [see personal numbering]. Business Advantage: Signalling systems and signalling system protocols like SS7 provide new services which enable companies and organisations to: use a single contact number for the life of an organisation (irrespective of change of premises), Use PSTN wide call forwarding and call back services rather than telephony services limited to a PBX system. Use caller ID information to search organisational databases in order to validate calls, perform credit checks etc Business Disadvantage: The largest disadvantage of signal systems and the SS7 protocol is the ensuing loss of privacy and anonymity since caller identity information is posted through the network along with the call. Related News Stories: tagish.co.uk Related Terms: Database Intelligent Networks SwitchesSIGNALLING SYSTEMS and SS7 Definition: Signalling systems are used send telephone network specific information over a telephone network between call switching centres. Signalling System 7 is a protocol suite used for communication with, and control of, telephone switches and their attached processors. Description: In recent years the telecommunications companies have marketed new telephony services such as caller ID, call blocking, and call forwarding. The availability of these services marks a fundamental change in the mechanisms which manage the underlying telecommunications infrastructure. The original public switched telephone network consisted solely of wires that carried conversation. Switching instructions created by dialling a telephone number were carried along the same channel as voice signals. This type of signalling was described as 'in-band'. In the late 1970's a technique called 'out of band' signalling was developed and deployed. Out of band signalling uses a separate data line to carry switching instructions between switching centres. Telephone switching computers used the out of band data lines in order to check whether a telephone line was able to receive a call before switching a connection to the local loop, rather than perform the switching and then find a busy line. Out of band signal systems were enhanced and further developed to enable information to be sent to specific locations in a telephone network and send small amounts of a data line via the local loop. Protocols were developed in order to govern the communications process between switching centres, the most important of which in digital communications is Signalling System 7. Signalling System 7 (SS7) integrates the public switched telephone networks and computers for switching purposes and enables the use of telephone network computer databases to develop an intelligent network. SS7 is implemented upon packet switched digital telephone networks and is used over a signalling system operating at 56 kb/s. Information held in the databases is used to control the switching of calls and transfer of messages through the system SS7 has enabled a number of new services including call forwarding, call blocking, and Caller ID. Application: Signalling systems provide the basis for intelligent control of telecommunications networks. Protocols such as SS7 provide the formal basis which governs information exchange between switching centres. The combination enables the development of new services such as: SS7 transmits the number of the calling party, which can then be matched up on a database with the location of the telephone. This enables emergency service operators (UK 999, mainland Europe 911 calls) to know the location of a caller instantly as the call is answered. Companies can use the telephone number provided by the intelligent network to automatically pull up the associated records with that number from databases. Finance and home banking services increasingly use this service to validate customer identities and perform credit checks. Caller ID as marketed to consumers uses the information from SS7 to display the calling parties number or name if hooked up to a database. SS7 enabled the development of personal numbering where a person can have one telephone number for life. As the user moves from, one location to another they register a new line number where they can receive calls. As people call that telephone subscribers number an SS7 enabled database will be used to find the necessary information to switch the call to which ever line number has been supplied. [see personal numbering]. Business Advantage: Signalling systems and signalling system protocols like SS7 provide new services which enable companies and organisations to: use a single contact number for the life of an organisation (irrespective of change of premises), Use PSTN wide call forwarding and call back services rather than telephony services limited to a PBX system. Use caller ID information to search organisational databases in order to validate calls, perform credit checks etc Business Disadvantage: The largest disadvantage of signal systems and the SS7 protocol is the ensuing loss of privacy and anonymity since caller identity information is posted through the network along with the call. Related News Stories: tagish.co.uk Related Terms: Database Intelligent Networks Switches domino.tag.co.uk Doug R .