Ericsson agreed to acquire Vonage, one of the earliest developers of a commercial VoIP service, for US$6.2 billion in cash.Vonage traces its roots to 1998 when Jeff Pulver established Min-X.com as a VoIP exchange. In 2001, the company changed its name to Vonage and launched a commercial VoIP services aimed at consumers. Vonage went public in 2006. Vonage is headquartered in Holmdel, New Jersey and has 2,200 employees throughout the United States,...