A group of users can be created with a purpose of receiving voice announcements through the speaker of a telephone set, but it has to be in the waiting mode.
ATCOM AT-530P IP phone allows making calls around the world without the use PSTN. It has two integrated 10/100 Mbps Ethernet ports and allow using this phone with the existing Internet connection. Atcom AT530P supports Static IP, DHCP-client and PPPoE.