Private Integrated Services Network (PISN) - Specification, functional model and information flows - Single step call transfer supplementary service [ISO/IEC 19459 (2001) modified]
Private Integrated Services Network (PISN) - Specification, functional model and information flows - Single step call transfer supplementary service [ISO/IEC 19459 (2001) modified]
Private Integrated Services Network (PISN) - Specification, functional model and information flows - Single step call transfer supplementary service [ISO/IEC 19459 (2001) modified]
