6.2.15 (2026-10-30)
Bug Fixes
- api: Add a knowledge base refresh method for POST /refresh-knowledge-base/{knowledge_base_id}. (e0cdde4)
- api: Add drama-3 as a selectable voice model option. (1560423)
- api: Add duplex as a response engine model type with a gpt-live-1 primary model, a text LLM backend, optional backup, and voice_prompt up to 15,000 tokens. (52475ce)
- api: Add list-templates to the app resource, calling get /list-app-templates to list the catalog of available integration app templates. (9075dee)
- api: Add on_hold_music to cold transfer options, with custom_on_hold_music_asset_id required when on_hold_music is custom. (8959fad)
- api: Add the optional inbound_fallback_enabled boolean to phone number objects and phone number update requests. (090c6ac)
- api: Add the optional privacy scope, limit, and pagination key query parameters to the list-app-templates request. (9075dee)
- api: Clarify createApp docs that providers supporting both OAuth and caller-managed credentials, such as Cal.com, also accept API keys. (e8fc8ae)
- api: Clarify updateApp docs that OAuth-only providers reject auth_config, while providers like Cal.com still accept caller-managed credentials. (e8fc8ae)
- api: Duplex is for Retell LLMs only and requires backend and voice_prompt. (52475ce)
- api: In duplex, tools' speak_during_execution is ignored and speak_after_execution is always on. (52475ce)
- api: Remove tool_call_strict_mode from Retell LLM and conversation flow settings, including call-level overrides. (dcc4f99)
- api: Return a knowledge base source-addition quota error for 429 responses from knowledge base creation and source addition. (e0cdde4)
- api: Update requests with inbound_fallback_enabled true require fallback_number to be set. (090c6ac)