Pass Context with Custom SIP Headers and Disconnect with REFER in Agentforce Voice

Agentforce Voice can now capture custom SIP X-headers from inbound calls (customer intent, language preference, case history) and pass them into Salesforce flows, where previously only the UUI SIP header was supported. Escalation and fallback flows can return or modify headers, and SIP REFER is now available as a disconnect and transfer method alongside SIP BYE. Turn on 'Include Custom SIP Headers and REFER Support' in Agentforce Voice Setup, then update the agent's escalation flow, add a fallback autolaunched flow, and edit the inbound Omni-Channel flow.