In 2005 they became one of the first telephony carriers to introduce the concept of "Dynamic Bandwidth" as an official product. Dynamic Bandwidth works by transmitting voice and data over a T1 connection using ATM as the underlying protocol. The amount of available bandwidth for data "expands" by 64k for each voice line not in use. When a voice line goes off-hook, the bandwidth reserved for that voice line becomes solely available for use with that line until the call ends, when it becomes usable for data again. Using this concept, a T1 that would normally provide 768k of data and 12 voice lines can provide a full 1.536 Mbit/s connection when no voice lines are in use.
