The TG703 is marketed under the brand Technicolor, formerly known as Thomson. The manufacturer described it as an “integrated access device” combining ADSL2+ modem, VoIP FXS and WiFi b/g/n.
These devices are commonly distributed by an ISP to double-play or triple-play customers. The firmware seems to be based on the previous Thomson firmware.
Not sure, if and how the firmware can be changed.