In our last VoIP installment, we looked at the main reasons why SIP has become a widely adopted protocol, but we left details of the protocol’s inner workings fairly vague. This article will drill ...

For all the technology behind Voice over IP (VoIP), you'd expect that it would work on every network, but this unfortunately isn't the case. Network Address Translation (NAT) is a common practice used ...

Stanaphone launched with an interesting proposition: give free US phone numbers to its users, and allow for cheap (sometimes free) phone calls, using SIP (Session Initiation Protocol) technology. At ...

WOBURN, Mass. — The oft-maligned Session Initiation Protocol (SIP) is getting a boost this month from startup Acme Packet Inc. The company's family of carrier-managed router and gateway products ...