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 ...

Update: We're in the last throes of winter break 2019, which means most Ars' home office phones can stay dormant for a few more days. As such, we've been resurfacing a few classics from the ...

Session Initiation Protocol (SIP) is a control (signaling) protocol developed by the Internet Engineering Task Force (IETF) to manage interactive multimedia IP sessions including IP telephony, ...

The resurgence of interest in VoIP to provide telephone services worldwide is often credited to the use of session initiation protocol (SIP) for signaling. Both residential and enterprise VoIP ...

The session initiation protocol (SIP) is one of the most popular signaling protocols used in applications that require a session setup and parameter negotiation before actual communication, as well as ...

Emmanuel Proulx is a SIP (Session Initiation Protocol) developer who has written an excellent tutorial on the signaling protocol that is widely used in VoIP to initiate communications sessions between ...

The WebRTC protocol promises to make it easier for enterprise developers to roll out applications that bridge call centers as well as voice notification and public switched telephone network (PSTN) ...

There will be at least three external interested parties to the SIP trunk implementation -- IP PBX/UC vendor, session border controller (SBC) vendor, and SIP trunk provider. In addition, there will ...

Sonus is integrating its DSC and PSX products to deliver a unified solution that provides policy control and signaling across legacy SS7 and next-generation SIP, ENUM and Diameter signaling domains.