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ETSI ETS 300 659-2
- Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 2: Off-hook data transmission
- standard by European Telecommunications Standards Institute, 09/01/1997
- Publisher: ETSI
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Definition of the protocol for off hook data transmission on analogue lines required to support display services such as Calling Line Identification Presentation for the PSTN.