ICT shall support all commonly used cross-manufacturer non-proprietary standard TTY signal protocols where the system interoperates with the Public Switched Telephone Network (PSTN)....
Search Results "PSTN: Publicly Switched Telephone Network"
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412.8.3 Signal Compatibility
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4. Coverage of Real-Time Text
First, the Advisory Committee recommended use of the TIA 825-A (Baudot) standard when ICT interfaces with the publicly switched telephone network (PSTN)....
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D. Real-Time Text
Such ICT would be required to support RTT either within its own closed system or outside a network....
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E102.8 TIA (Section-by-Section Analysis)
E102.8 TIA (Section-by-Section Analysis) TIA 825-A (2003), A Frequency Shift Keyed Modem for Use on the Public Switched Telephone Network, would be incorporated by reference at 410.6.3.1...
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410.6.3 Interoperability (Section-by-Section Analysis)
410.6.3 Interoperability (Section-by-Section Analysis) This section proposes that, where ICT with real-time two-way voice communication operates outside of a closed network or connects...
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410.6.3 Interoperability
Where ICT interoperates outside of a closed system of which it is a part, or where ICT connects to other systems, ICT shall conform to 410.6.3.1 or 410.6.3.2.