BOULDER, Colo. - s4story -- What is SIP?

Session Initiation Protocol (SIP) is the industry-standard protocol powering the global VoIP ecosystem — the technology behind enterprise phone systems, call centers, and telecom providers worldwide. Key characteristics:

• Routes voice calls over the internet instead of traditional phone lines
• Has been the backbone of business telephony for decades
• Acts as a universal language between phone carriers and software platforms

How Does It Work?

Stream's inbound SIP trunk connects external VoIP calls directly into Stream-powered calls via the Stream SIP bridge. Setup is straightforward:

• Create a trunk in the Stream dashboard using a phone number from Twilio or Telnyx
• Define routing rules — either fixed (all calls land in one Stream call) or dynamic (unique call IDs generated per call using templates)
• Authenticate securely using SIP credentials managed directly in the Stream dashboard

Who It's Built For

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This feature is designed for teams building communication-critical products where users need to join from a standard phone number:

• Telehealth platforms where patients dial in without a smartphone or app
• Enterprise collaboration tools bridging desk phones with digital meetings
• Customer support platforms routing inbound calls into agent queues
• Any product that needs to meet users on a plain old phone line

Why It Matters

Not everyone has a smartphone or reliable internet — and not every workflow starts in an app. Inbound SIP trunk support means:

• No need to maintain a separate telecom stack alongside your Stream integration
• Phone calls and app-based calls converge in a single platform
• Broader user reach, regardless of how people choose to connect
• Simpler infrastructure with less operational overhead

For more information, visit getstream.io/video/docs/api/sip/inbound-trunk.