Building and refining AI voice agents can be tricky. Every word, phrase, and branch of logic impacts your agents’ performance and, in turn, your customers’ experience.
AI voice agents have the potential to scale a sales team’s reach like never before, so why do many businesses hesitate to fully embrace them?

telli Duo Agents replace ‘cascading architecture’ with the future of Voice AI: speech-to-speech models that can talk and listen at the same time.

telli raised $15 million in a seed round to develop its artificial intelligence (AI) agent builder focused on customer-facing AI agents.
KI-Startup telli sammelt 15 Millionen ein
telli has raised $15 million to define the next era of AI in customer operations. Led by redalpine, with participation from Wayra/Telefónica, Cherry Ventures and Y Combinator.
Berlin-based telli has raised a $15M seed round led by redalpine. Founded by ex-Enpal operations leads, the startup builds AI voice agents for B2C sales.
Berlin-based telli has secured seed funding to expand its AI platform for customer-facing operations, supporting businesses in automating customer interactions across multiple communication channels while scaling its engineering and commercial teams.
telli, a Berlin-based startup building AI that runs customer-facing operations for B2C companies, today announced a €13.1 million ($15 million) Seed

Building and refining AI voice agents can be tricky. Every word, phrase, and branch of logic impacts your agents’ performance and, in turn, your customers’ experience.
telli has raised a $15M seed round led by redalpine, with support from new and existing investors, including Cherry Ventures and YC.

We’re excited to introduce our latest product update: EU hosting.

AI voice agents have the potential to scale a sales team’s reach like never before, so why do many businesses hesitate to fully embrace them?
telli is coming to France. Country Manager Charles Lorin on why France can set tomorrow’s standards in customer relations and what telli is here to build.
Successful AI voice agent deployment depends far more on upfront preparation than the underlying software. Follow this step-by-step guide to map workflows, configure integrations, test thoroughly, and execute a seamless phased rollout.
Stop relying on flashy demos and feature lists to make your purchasing decision. Learn how to evaluate, test, and select the right AI voice agent based on your actual workflows, integration needs, and business goals.
Conversational AI is the underlying engine, while AI voice agents are the specific vehicle built for phone calls. Learn the key differences between the two to choose the right automation solution for your business channels.
Tracking call volume won't tell you if your AI voice agent is actually working. Discover the core metrics across customer experience, operations, and business outcomes needed to turn raw data into continuous improvement.
Personal AI agents now book appointments, request refunds and cancel subscriptions for consumers. Here is how businesses can prepare to serve them.
The secret to a reliable AI voice agent lies in its prompt, not just the underlying language model. Discover best practices for crafting, testing, and securing conversational prompts that drive real business results.
A guide to calculating, benchmarking, and reducing Average Handle Time. And how AI voice agents help teams do more without rushing conversations.
A complete guide to measuring and reducing cost per contact in customer service operations, and the role AI voice agents play in driving down costs without sacrificing quality.
Traditional IVR menus simply route calls, while modern AI voice agents actually understand and resolve customer requests. Learn the key differences between the two systems and discover when it's time for your business to upgrade.
Stop comparing endless feature lists and start focusing on business outcomes. Discover which conversational, automation, and enterprise capabilities actually drive results for your specific use case.
In this guide, we give you a comprehensive breakdown of how to test your AI voice agents, including industry benchmarks you should be aiming for.
Learn how AI voice agents work from speech recognition and LLM reasoning to knowledge retrieval, APIs, and natural voice responses.
Learn how to secure AI voice agents, manage compliance risks, and protect customer data. Explore GDPR, HIPAA, SOC 2, AI security threats, and more.
A practical guide to understanding both customer and employee churn, the benchmarks that matter, and how AI voice agents can reduce attrition across the board.
Everything you need to know about tracking, benchmarking, and improving lead conversion rate, and where AI voice agents make the biggest difference.
Learn how to calculate FCR, benchmark your performance against industry standards, and use AI voice agents to resolve more issues on the first call.
Learn how to calculate, benchmark, and improve CSAT with proven customer support strategies and AI automation.
Curious about AI real estate agents? Learn how companies like Engel & Völkers LiquidHome use AI to scale lead outreach, automate follow-ups, and increase conversions.
We compare the best AI voice agents for customer service, including telli, Parloa, Retell, and Synthflow, to find the right platform for automation, scalability, and customer experience.
Learn what AI voice agent barge-in is, how it works, why it improves customer experience, and how we’re solving for it at telli.
AI voice agents are on the rise, but which ones truly deliver bookings? We explore the top options and what sets them apart.
Learn how AI voice agents qualify leads instantly, capture key data, and increase conversions with faster, more consistent follow-up.
Unlock higher retention with AI: Explore actionable strategies, real-world results, and top tools for AI-powered customer engagement.
Learn how AI receptionists work and why businesses use them to automate calls, improve customer experience, and never miss a lead.
Compare Retell AI's API, pricing, features, pros and cons, and the best Retell AI alternatives in one guide.
Review Vapi's API, pricing, features, pros and cons, and compare the best Vapi alternatives for AI voice agents.
Read our Synthflow review covering pricing, features, ratings, and the top Synthflow alternatives for AI voice automation.
Read our ElevenLabs review covering voice AI features, pricing, ratings, and the best ElevenLabs alternatives.
Discover Fonio's pricing, features, pros and cons, and compare the best Fonio alternatives before choosing a platform.
Explore our Parloa review with pricing, features, pros and cons, and the best Parloa alternatives for enterprise AI voice.
Read our Bland AI review covering features, pricing, pros and cons, ratings, and the best Bland AI alternatives.
Read our telli review covering pricing, features, pros and cons, and the best telli alternatives for AI voice automation.