The communications function of "connection establishment" is influenced by how quickly end-to-end connections are implemented and how quickly the network components are returned to a ready to serve state.
ITU-T E.431 SPANISH-1992 Referenced Document
ITU-T E.430 Quality of Service Framework (Study Group II) 6 pp
ITU-T E.721 Network grade of service parameters and target values for circuit-switched services in the evolving ISDN Study Group 2; 11 pp*, 1999-05-01 Update
ITU-T E.431 SPANISH-1992 history
1992ITU-T E.431 SPANISH-1992 Service Quality Assessment for Connection Set-up and Release Delays (Study Group II) 6 pp