Open for Sinch

Sinch stays your voice provider. Numbers, regulatory bundles, and the global PSTN reach Sinch is known for all stay where they are. Open is a SIP endpoint your Sinch Voice application or SIP trunk forwards calls to. When a call should be handled by AI, Sinch sends the INVITE to Open, the AI picks up, and the rest of the conversation runs over the same SIP/RTP path.

For inbound, the typical path is a Sinch Voice application callback that returns an SVAML connectSip action targeting the Open SIP URI. If you're on Sinch SIP Trunking, you instead configure a termination route in the Sinch portal that sends inbound DIDs to Open — same effect, less code.

For outbound, Open opens a SIP session against your Sinch SIP termination URI using digest credentials. Calls land in your Sinch CDRs the same way as today, with whatever caller IDs Sinch has approved on the trunk. AI-driven outbound campaigns run from Open while staying on the Sinch carrier leg.

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

Billing stays predictable. Sinch bills carrier minutes at their published rate; Open never marks them up. Open charges per resolved conversation, not per agent or per seat.