Whereas Standard ECMA-133, “Reference Configurations for Calls through Exchanges of Private Telecommunication Networks”, specifies that, in general, bearer services of an intervening network are used to link Private Telecommunication Network Exchanges (PTNXs) at reference point C, this Standard classifies the different means by which PTNXs are able to use and control bearer services provided by intervening networks
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ECMA-135
Scenarios for interconnections between exchanges of Private Telecommunication Networks
1st edition, April 1989
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