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Field Phone Host Board
The field phone host board is the essential central component of a field phone deployment. This board provides the following features:

- Communication between off-the-shelf wired telephones.
- Operation from external 6v to 30v power.
- Charging and operation from a lithium iron phosphate (LiFePO4) battery.
- Provision of discreet ring signaling to remote phones (optional ring interface modules required at remotes)
- Ability to operate two distinct call networks, or to bridge these together into a single network.

Ring Interface Modules
A ring interface module provides ring indication at a remote phone when wired to a field phone system board via 4-wire telco wiring. Optional models of the ring interface module support different remote needs.