This standard defines the interworking relationship between the D-channel layer-3 functions and protocol employed across an ISDN User- Network Interface and an interface using the Session Initiation Protocol (SIP) augmented by the Narrowband Signaling Syntax (NSS) with ANSI Extensions.
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Interworking between the ISDN User – Network Interface Protocol and the Session Initiation Protocol (SIP) with ANSI Extensions to the Narrowband Signaling Syntax (NSS)
The Alliance for Telecommunications Industry Solutions , 08/01/2008
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