Knowledge Base 2.0

Our Knowledge Base just got a major upgrade, and your AI agents are now a whole lot smarter:
- Smarter recall: Agents now focus on the most relevant parts of each conversation to retrieve accurate answers.
- Improved ranking: Irrelevant chunks no longer show up ahead of the correct information.
- Better precision: Key details like phone numbers and addresses are much more likely to surface, even when earlier conversation turns introduce unrelated context.
In large-scale tests across multiple use cases, KB 2.0 achieved:
📈 Up to 50% improvement in answer accuracy
🔍 More relevant top-ranked results
🧠 Clearer answers to complex, multi-turn questions

Warm Transfer 2.0

We’ve rolled out major improvements to warm transfers to give you more control and clarity during call handoffs:

• Human Detection: Transfers now include automatic human detection. The AI agent will only complete the connection if it confirms a human is on the receiving end.
• Whisper & Three-Way Messages: Customize the experience with optional whisper messages (spoken only to the transfer target) and three-way messages (heard by both the caller and the target) during the handoff process.
• On-Hold Music: Choose the music your caller hears while they’re on hold during the transfer.

Links to documentations: transfer call function, transfer call node

Analytics Dashboard 2.0

You can now turn post-call analytics into visual charts. Such as appointment booking rate, interest level, or lead score.
📊 Add a new chart
🎯 Select an agent, choose post call analytics metrics
🎨 Choose a chart: column, bar, donut, or line

Extract Variables in Real Time

Your agents can now extract and store dynamic variables live and mid-conversation, with reliably and accurately retrieved information.

Your agents can now:

• ✅ Automatically save names, emails, budgets, and preferences
• ✅ Reference collected data anytime during the call
• ✅ Pass dynamic variables to webhooks, CRMs, or integrations
• ✅ Personalize workflows in real time—no custom logic required
  

Variable Types You Can Collect:

• Text: Names, addresses, feedback
• Numbers: Ages, quantities, prices
• Boolean: Yes/no decisions, preferences
• Enum: Predefined lists (services, products, etc.)‍‍

Work in both single, multi and conversation flow agent.

See Docs

Cartesia Voice

We’ve partnered with Cartesia to bring your agents a lifelike, ultra-smooth voice experience.

You can now set Cartesia as your default voice, or use it as an automatic fallback if your primary provider goes down.

See Pricing

Global Node Fine Tuning

You can now add example conversations for AI to know when and when not to jump to Global Nodes in your agent’s conversation flow.

Start using by enabling the Global Node option on any node in the conversation flow builder.

Knowledge Base Auto Add Future Pages

You can now enable auto-add future pages for specific URL paths.

Once enabled, any new pages added under those paths will be automatically detected, crawled, and kept up to date.

For example, if you specify a domain like docs.retellai.com, any new pages added under that domain will be auto-crawled going forward.

Other Improvement

1. View Call History in LLM Playground You can now track how a past call transitioned through each node in the conversation flow.‍
2. Regenerate Response For Single/Multi Prompt
3. Tool mock for Single/Multi Prompt

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