How it's used: Session Initiation Protocol (SIP) manages communications sessions across an IP network. It locates participants for a session using a user's SIP URL (similar to an e-mail address), ...
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 ...
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