The name of the company is TC communications, out of Irvine,California.
They make the TC1900, Fiber voice extender.
The other is the TC1910, voice over ethernet extender
The site is http://www.tccomm.com
They also make some interesting boxes, like T1 or E1 extenders over fiber, in case that you need to extend thatE1 service betwen buildings or floors.