CHAPTER 4. OfficeServ 7400 Functions4-10 © Samsung Business Communications4.3 UMS FunctionsThe OfficeServ 7400 provides the Unified Messaging System (UMS) which includes theauto answering, voice message, and integrated e-mail message management functions.VoIP UMS processes the call signal using the VoIP module, which has the SIP protocol forthe interface to the voice switch, and transmits the media through the RTP protocol of theTCP/IP. Accordingly, OfficeServ 7400 has superior architecture for capacity expansion andis cost effective, since there is no need for the physical interface required for the existingUMS or VMS.4.3.1 Auto AttendantAnnouncement Replay and Auto Call Forwardy This system replays the announcement when a calling party is connected to the auto at-tendant. This announcement can be specified based on holidays, working hours, or non-working hour.y The auto call forward connects a calling party to the desired subscriber’s station whenthe calling party dials a station number in the auto attendant. In this case, the call routingfunction will be also provided: this detects whether the entered phone number is valid,or that the length of the phone number can be changed.Announcement Auto Change Based on the ScheduleAllows the administrator to automatically change and replay the announcement based onholidays, working hours, and non-working hours.Announcement Change by TelephoneAllows the administrator to change the announcement by interfacing to the auto attendantfrom a remote site.Call Forwarding to the Mailbox on the Busy LineWhen a calling party interfaces to the auto attendant and tries to connect the call to a busystation, the called party on the busy station can use this function to forward the call to thevoice mailbox.Queuing Process on the Busy LineWhen a calling party interfaces to the auto attendant and tries to connect a call to a busystation, and the ‘Call Forwarding to the Mailbox on the Busy Line’ function is not set (seeabove), a ‘please hold’ message is played and the connection is retried for a specified time.If the line continues busy after the maximum retry time, another voice message is providedasking the caller to either forward the call to the voice mailbox or hang up.