(from the article `telephone and telephone system`) Despite the simplicity of the in-band method, this type of signaling presented a number of problems. First, because the in-band signals by necessity ... Found on http://www.britannica.com/eb/a-z/o/40
(from the article `telephone and telephone system`) Despite the simplicity of the in-band method, this type of signaling presented a number of problems. First, because the in-band signals by necessity ...