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 ...

Avaya and Nokia have launched a dual-mode softphone client for Eseries handsets. The Avaya one-X Mobile Dual Mode Edition allows a user to connect through their office-based Avaya PBX from an Eseries ...

Switzerland-based O-FONE (not to be confused with Microsoft’s oPhone) has released a SIP VoIP client for Symbian’s S60 platform. Perhaps more interesting than the client itself is their claim that ...

Last time I gave a high level overview of SIP and also took a look at SIP network element types. This time, I’ll be looking at SIP message and method types, and describing how SIP network elements ...

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 ...