Supplement provides enhancements to Conference Calling to expand and improve the applicability of the ISDN Conference Calling service. Formerly known as T1.647a-1998(R2005).
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ATIS 1000647.a.1998(S2020)
Original price was: $30.00.$15.00Current price is: $15.00.
ISDN – Conference Calling Supplementary Service – Operations Across Multiple Interfaces
The Alliance for Telecommunications Industry Solutions , 12/01/1998
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