ISO/IEC 20115:2004, Information technology - Telecommunications and information exchange between systems - Private Integrated Services Network - Use ... Message Centre Access (MCA) profile standard

ISO/IEC 20115:2004 specifies the combination of base standards, together with the selection of appropriate options and parameter values, necessary to specify how QSIG/PSS1 can be used for Message Centre Access (MCA) procedures.ISO/IEC 20115:2004 identifies the necessary or optional employment of particular functions, procedures and services for aCalling User to deposit messages for a Served User at a Message Centre,Served User to monitor the Served User's Mailbox for new messages,Served User to browse through the messages saved in the Served User's Mailbox,Served User to retrieve the messages saved in the Served User's Mailbox, andServed User to get connected to the Originator of a message or any other destination.