Disclosed are various embodiments for transmitting data between an integrated head-end system and endpoint devices of a utility metering system. The utility metering system may include a single head-end system including an application layer, an end-device protocol layer, and a network protocol layer operable to generate messages for transmitting to the endpoint devices to obtain metering information. The layers may also be operable to interpret messages received from the endpoint devices including the metering information and convert the messages into a usable format. In some aspects, the end-device protocol layer and the network protocol layer may include adapters for converting information included in the messages based on a metering protocol or network protocol, respectively, used by the endpoint devices.