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Create a Sinch static endpoint that targets the platform SIP FQDN and assign the DID. Sinch’s static-endpoint field expects the port and transport appended to the hostname, not a bare FQDN — use <platform-sip-fqdn>:5060;transport=tcp for standard signaling, or :5061;transport=tls for secure trunking. In the platform, use the exact +E.164 DID and Provider source IPs. Sinch ACL/digest choices documented for calls into Sinch belong to outbound authentication, not the Sinch-to-platform inbound path. Allow all eight Sinch SIP-signaling CIDRs:
Do not add the separate RTP/media ranges as inbound authentication addresses.

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Validate

Call the assigned DID externally and confirm a new inbound record, the expected assistant, and two-way audio. If signaling arrives but audio fails, investigate media separately instead of widening the signaling allowlist. Source: Sinch Elastic SIP Trunking networks. Accessed 22 August 2026.