Layered Caller Verification for LiveKit SIP Calls

Identity verification for inbound SIP callers in LiveKit is structured across three layers: trunk-level filtering, dispatch-rule-level controls, and participant-level identification, each offering increasing granularity. Trunk-level filtering ensures the trustworthiness of the trunk and can restrict caller access to a predefined list of numbers, though caller ID spoofing is possible. Dispatch-rule-level controls route calls to specific rooms and can use PINs and inbound numbers for additional access control, treated as routing hints rather than secure authentication. Once a call is accepted, it becomes a SIP participant, and the agent can access a range of SIP attributes, including phone numbers and custom headers, to identify the caller. However, these attributes are not definitive proof of identity. Therefore, agents should verify caller identity directly during the conversation using methods such as account numbers, shared secrets, or OTPs to ensure secure handling of sensitive information.

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