Open for Bandwidth

Bandwidth remains the carrier of record — DIDs, toll-frees, E911 provisioning, regulatory compliance, and 911 routing stay exactly where they are. Open is a SIP destination your Bandwidth Voice API application or SIP trunk forwards calls to. When a call should be handled by AI, Bandwidth sends the INVITE to Open, the AI picks up, and the rest of the conversation runs over the same SIP path.

For inbound, the cleanest path is a Bandwidth Voice API application that returns a BXML <Forward> (or <Transfer><SipUri>) to the Open SIP URI on the calls you want AI'd. If you're on Bandwidth Duet (the SIP Trunking product), you point the trunk's outbound termination at Open instead — equivalent result, less code.

For outbound, Open opens a SIP session against your Bandwidth SIP termination URI using IP allowlisting (Bandwidth's preferred auth) or digest credentials. Calls land in your Bandwidth CDRs the same way as human-dialed calls do, presenting whatever caller IDs you've approved.

What the AI does on the call: it listens, reasons over your knowledge base and connected tools, and acts — looking up an order, creating a ticket, scheduling a callback, sending a payment link, or warm-transferring to a human via SIP REFER with the live transcript and detected intent attached. Every call is recorded and trace-logged.

E911 stays where it should: on Bandwidth. The AI won't initiate emergency calls itself; if a customer asks for emergency help, the AI either passes the call straight through to your existing 911 path or warm-transfers to a human, depending on how you've configured the agent.