In Part 1 of our SIP primer, I covered the SIP foundation layers starting from the message structure and ending with the SIP transactions. We saw how phone registrations and proxies could work using ...
RFC 4474 implements Public Key Infrastructure (PKI). This provides an authenticated identity for the originator of a VoIP call. There is a security hole in the SIP protocol. According to John Nix, VP, ...
An early SIP pioneer, Johnston says the protocol still offers promise of multi-vendor interoperability as well as vendor innovation. Alan Johnston is one of the SIP pioneers. He's an author of IETF ...
Secure SIP is a security mechanism defined by SIP RFC 3261 for sending SIP messages over a Transport Layer Security-encrypted channel. Originally used for securing HTTP sessions, TLS can be repurposed ...
Session Initiation Protocol is used widely for the setup, teardown and management of VoIP calls. Much of its functionality is related to the setup of calls, as its name implies. Part of this setup ...
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 ...
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