The following lines were added (+) and removed (-):
Modern trunks now use digital communication technology to lower costs and make more efficient use of each line. The most popular trunk is the '''T1 line'''. T1 is a digital telephone standard that creates 24 individual channels in a strictly timed digital bitstream. Each channel can carry one telephone call. T1 voice lines can do the work of 24 individual analog trunks lines. A T1 uses multiplexing/ de-multiplexing techniques (the bitstream.) Even more advanced VOIP SIP Trunks, as mentioned earlier push the envelope on call volume capabilities.