SIP is the standard protocol used for initiating, maintaining, and ending voice and video calls over the internet.
Why it matters:
- The foundation of most VoIP and UC systems.
- Enables advanced features like call forwarding, video conferencing, and presence.
- Works with SIP trunks to connect to the public phone network.
Pro tip: SIP gives flexibility — but misconfigured SIP settings are a common cause of call quality problems.
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