> 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.

# Deprecations

## Docs

- [Telephony API Migration (trunks & caller IDs)](https://docs.smallest.ai/api-reference/deprecations/telephony-migration.md): SIP trunks become first-class resources, an agent answers on a number, and every call names its own caller ID. What changed, what still works, and how to move.
- [Deprecation Notices](https://docs.smallest.ai/api-reference/deprecations/voice-agents.md): Index of Atoms API endpoints that are deprecated or scheduled for removal, with the migration target for each.
- [Agent Versioning Migration Guide (v1 → v2)](https://docs.smallest.ai/api-reference/deprecations/agent-versioning-migration.md): Endpoint-by-endpoint mapping from the old /agent/{id}/drafts + /agent/{id}/versions API to the branch-and-revision API.
- [Deprecation Notices](https://docs.smallest.ai/api-reference/deprecations/models.md): Index of Smallest AI model tags, endpoints, and parameters that are deprecated or scheduled for removal, with the migration target for each.