This standard specifies the service capabilities of the Call Hold service within the context of an Integrated Services Digital Network (ISDN). Formerly known as T1.616-1992(R2009).
ATIS 1000616.2014 (R2019)
Original price was: $145.00.$72.00Current price is: $72.00.
ISDN – Call Hold Supplementary Service
The Alliance for Telecommunications Industry Solutions , 06/01/2014
Pages: 31
