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Study Group 11 is the 'signalling' group within ITU-T; it produces ITU-T Recommendations that define how telephone calls and other calls such as data calls are handled in the network. Previously this was mostly in the public switched telephone network (PSTN) and Integrated Services Digital Networks (ISDN). Now as operators look to align this 'circuit switched' based environment with the rapidly emerging Internet technologies, SG11's work is shifting towards Internet protocol (IP) based networks or next generation networks (NGN).
 ITU-T SG 11 Home
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