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In Bandwidth, route the number’s Voice Configuration Package to the platform SIP FQDN. In the platform, use the exact DID in +E.164 and select Provider source IPs.
Bandwidth does not provide one safe global signaling allowlist for this setup. The address depends on the account, zone, product, and trunk group, and can change during SBC migrations.
Open the Bandwidth App and copy every signaling IP for the relevant entry under Account → Trunk Group Configurations. Choose the addresses for the transport in use; standard SIP and SIP-over-TLS can use different endpoints. Do not substitute media ranges or an address copied from another Bandwidth customer. Bandwidth’s documented digest realm is for customer-to-Bandwidth termination. For Bandwidth-to-platform delivery, authenticate by the account’s current source IPs unless Bandwidth explicitly enables a different downstream method for your account.

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Validate

Call the exact DID externally. Confirm a new inbound record, the assigned assistant, and two-way audio. Save a screenshot or export of the current Bandwidth trunk-group addresses with the setup record so future changes can be compared safely. Sources: Bandwidth Vapi integration, Bandwidth Voice Configuration Packages. Accessed 22 August 2026.