Configurations of GSM/VoIP networks allow the service providers to avoid the local Wired Public Switched Network (PSTN) in communication with a GMS mobile handset. As a result, the high rates charged by telephone companies are avoided.
JSC Central Telegraph is one of the leading carriers in Russia; its history is more than 150 years long. The history of Central Telegraph is closely related with the development of communication in Russia. Telecommunication technologies developed, the lif
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