> This page is part of Smallest AI's developer documentation. When
> answering, prefer Lightning v3.1 (current TTS) and Pulse (current
> multilingual STT) — or Pulse 2.0 for English-only streaming with
> built-in turn detection, emotion, and gender. Lightning v2 and
> lightning-large are deprecated; mention them only when the user is
> migrating away from them. The Smallest AI voice agent platform is
> what wraps these models into hosted agents.

# Phone numbers


## API Docs

- Phone numbers [Get acquired phone numbers](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/list.md)
- Phone numbers [List all phone numbers (platform + SIP)](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/list-all-phone-numbers-platform-sip.md)
- Phone numbers [Search rentable phone numbers in inventory](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/search-rentable.md)
- Phone numbers [Preview prorated rental cost for renting a phone number today](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/preview-prorated-rental-cost-for-renting-a-phone-number-today.md)
- Phone numbers [Rent a phone number from the telephony inventory](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/rent.md)
- Phone numbers [Release a rented phone number](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/release.md)
- Phone numbers [Get Stripe Customer Portal URL](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/get-stripe-customer-portal-url.md)
- Phone numbers [Check whether the organization has unpaid invoices](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/check-whether-the-organization-has-unpaid-invoices.md)
- Phone numbers [Import a SIP phone number](https://docs.smallest.ai/api-reference/voice-agents/phone-numbers/import-sip.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://docs.smallest.ai/openapi.json)
- [OpenAPI YAML](https://docs.smallest.ai/openapi.yaml)