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In Plivo, create an Origination URI pointing to the platform SIP FQDN and assign the DID. Plivo explicitly supports authentication_needed, username, and password on the Origination URI. Therefore SIP username/password is the preferred platform inbound mode when those same credentials are configured in Plivo.
Plivo has EU points of presence in Frankfurt, London, and Dublin. Select the EU region when creating the trunk if your numbers or customers are in Germany or elsewhere in the EU — it keeps signaling closer to home and can matter for data-residency requirements.
Use the exact DID in +E.164. Use TCP for standard signaling. For TLS use 5061 and enable SRTP at both ends. If digest is not enabled, select Provider source IPs and allow all current Plivo signaling ranges for failover:
Do not configure both modes with unrelated credentials. Outbound Zentrunk authentication remains a separate provider-to-destination direction.
Plivo’s Strict Caller ID setting (the per-number DIP profile) rejects or flags outbound calls for fraud review when the caller ID doesn’t match a Plivo-verified number. Disable it, or verify the caller ID in the DIP profile, before relying on outbound calls from this trunk.

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Call the exact DID externally and confirm a new inbound record, correct assistant, and two-way audio. If using digest, a provider authentication failure must be visible before changing to IP authentication. Sources: Plivo Origination URI authentication, Plivo Zentrunk networks. Accessed 22 August 2026.