A terrestrial phone is any phone that will not use the cellular network to make and receive calls. This will include DECT phones, POTS phones, SIP phones, and Wifi phones. These phones will connect to the localized network to make and receive calls when going beyond a network, the device no longer can make or receive calls unless they return to the network. All new phones must use USB-C for charging. In the case of POTS phones, they will receive their power from the ATA, and will not support new standards. With exception of POTS phones which are no longer being sold, all phones must support a user replaceable USB-C to USB-C cable that will plug into the phone, and then into the wall.
ATAs (Analog Telephone Adapter) are only required for POTS phones. All ATAs must have a web based configuration system that the user can log into, and make any changes. An ATA must support at least one provider, but can support multiple providers. Any ATA must support RJ11 for telephone as well as the local telephone jack (if different). In addition, they must support RJ45 for plugging into the LAN, and therefore the network. SIP Phoens are usually thought of as desk phones, and will be able to be powered by POE in most cases. with USB-C as a fall back. The property owner must provide a network switch that will support all of the standard POE ports + 8 additional ports. This means that if there are 4 Wifi Access Points, then the switch must support 12 POE connections. Wifi phones uses the network’s Wifi connection to make and receive calls. The phone must support USB-C charging, or plug into a cradle that does.
DECT (Digital Enhanced Cordless Technology) phones will have 3 components. There is the access point. This is where all of the phones will connect to for making and receiving calls. This is the most important component. Some base stations will have a digital answering machine, but since the provider is required to provide for voicemail, this is not important. All access points must support RJ45 for calling, and use USB-C for plugging into power. There is also the phone. All phones will use the 1.9Ghz band which is sufficient for receiving voice, and CID information. It also offers a farther range than what a 2.4Ghz phone can do. All phones will either plug into USB-C or have cradle charging pins for the cradle. The cradle is for charging the phones.