Wired for sound: How SIP won the VoIP protocol wars [telecom]

From the archives: An in-depth look at VoIP, specifically its past.

By Gilad Shaham

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 archives - the latest being this look at how SIP (Session Initiation Protocol) won the VoIP protocol wars once upon a time. This story first appeared on December 8, 2009, and it appears unchanged below.

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Monty Solomon
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