Historical
ANSI T1.616-1992 (R1999)
ISDN Call Hold Supplementary Services
This standard specifies the service capabilities of the Call Hold service within the context of an Integrated Services Digital Network (ISDN). The Call Hold service allows a served user to interrupt B-channel communications on an existing call and then subsequently, if desired, re-establish communications. The associated switching and signaling specifications are also provided. This service may be made available on demand or in a subscription arrangement. The interaction of this service with other service capabilities defined in American National Standard is also included.
Alliance For Telecommunications Industry Solutions [atis]