| Publisher | Acterna Corporation | ||
|---|---|---|---|
| Format | 1.2MB PDF, requires Acrobat Rdr 5 | Date added | 14 Aug 2003 |
| Topics | Telephony Systems - PBX, Telecom Services | ||
| Downloads | 120 | ||
Three types of services are defined by the CCITT : bearer services, teleservices, and supplementary services. Bearer services provide the means of conveying information (speech, data, video etc.) between users in real time without altering the content of the message. These services correspond to the lower three layers of the OSI model. Teleservices combine the transportation function with the information-processing functions, which correspond to OSI layers 4 through 7. Example of teleservices are telephony, teletex and videotex. This guide has been made to help users understand the main supplementary services used today and the test principle proposed by WWG with the IBT range (WWG IBT-5, IBT-10/-10U and IBT-20). The WWG SSE-100 provides a similar solution based on the IBT principle to test the supplementary services.
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