Powering Voice AI for India (@ycombinator f25)
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Joined January 2024
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How often do your calls to customers end up in voicemail?
And who pays for the minutes spent on answering machines, while your customer thinks they never heard from you?
On Bolna, built-in voicemail detection closes this gap across all your calls. Your voice agents no longer spend time and money waiting on voicemail while your customers miss your call in the middle of their busy day.
You know exactly who picked up and who needs a call back, and auto-retry follows up at a time that suits them. That way, you protect retention and give every call the precision your customers deserve.
As an enterprise, your attention should stay on exceptional customer care, and we’re here to make sure it does. Try running a campaign on @bolna_dev today and see it for yourself!
What goes into a voice agent that can hold a conversation with India?
Our panelists will take apart the stack behind it, layer by layer, on the Symphony main stage, in a conversation moderated by @prasanna_says.
On the panel:
@sumangbcn
@kamath_sutra
Pablo Tachil
Come listen to them, and bring your questions.
Link to get the tickets: bolna.ai/symphony
20 Nov 2026 | 13:00 – 13:30
SUR · Main Stage, The Lalit Ashok, Bengaluru
When your whole team keeps iterating on the same voice agent, it gets hard to keep track of the changes, and the chaos adds up with no visibility.
On Bolna’s Canvas, you can now see every change ever made to your agent, with the option to restore an earlier version if an edit doesn’t turn out the way you imagined.
All it takes is one click to go back to the version you prefer, or to find where the agent might have broken.
Easy to build an agent, co-working on it with your team is even easier. Try it out on @bolna_dev now!
Symphony now has its sterling silver finish.
We’re excited to welcome @WisprFlow , @elisiontec (VoiceLink), @cartesia , @DeepgramAI , @navanatech , @smallest_AI , @agnostai to the ensemble as Silver Sponsors of Symphony: India’s Flagship Voice AI Summit.
Thank you for helping us build a stage for of India’s Voice AI community.
The orchestra is almost complete, and the last seat left to fill is yours.
Link to get the ticket: bolna.ai/symphony
📅 November 20, 2026
📍 The Lalit Ashok, Bengaluru
Which Symphony hall are you? 👀
You have opinions about Voice AI and want to hear from the people shaping it:
Sur (Main Stage)
This is where Fireside chats, panel discussions from people leading Voice AI in India and Bolna product launches will happen.
Your GitHub streak is your entire personality:
Abhyas (Build Stage)
Learn from case studies, build alongside experts, and get your hands on features that haven’t been released yet. If you have a startup, pitch it to investors live at Voice Tank.
Your LinkedIn grows at least by five connections at every event you attend:
Mehfil (Experience & Networking)
Catch live demos of some cool Voice AI products and talk to the people behind them.
If you can’t pick one, the good news is your Symphony tickets gets you access for all three so go get your ticket now: bolna.ai/symphony
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What if you never had to give your startup pitch yourself?
Voice Tank at 𝗦𝘆𝗺𝗽𝗵𝗼𝗻𝘆: 𝗜𝗻𝗱𝗶𝗮’𝘀 𝗙𝗹𝗮𝗴𝘀𝗵𝗶𝗽 𝗩𝗼𝗶𝗰𝗲 𝗔𝗜 𝗦𝘂𝗺𝗺𝗶𝘁 is where your Voice AI agent takes the stage, pitching straight to @sameeraculous from @BlumeVentures and @SiddhantD06 from @generalcatalyst.
The agent gets 5 minutes to pitch your story, and you get the next 5 minutes to answer questions.
This could be your best shot at funding from the people backing India’s next startups.
Applications close on 13th November, so hurry up!
Link to register: bolna.ai/symphony/voice-tank
📅 November 20, 2026
📍 The Lalit Ashok, Bengaluru
Happy Diwali from Team @bolna_dev! 🪔
Last Diwali, five of us celebrated around a single table. This year, we needed a considerably larger room for a full house (the group photo now needs a wide-angle lens).
Slack went quiet for an evening, and nobody missed it.
Wishing your Diwali is as bright and happy as ours was! ✨
Voice Agents do more than understand what you say. They decide what to do next.
Introducing DECIDE, a benchmark for evaluating those decisions on real production calls.
benchmark.tazolabs.com/
Introducing DECIDE: a benchmark for audio decisions in voice agents, in association with @bolna_dev
A voice agent doesn’t just transcribe. It decides: speak or wait, route the call, pick a tool, switch language. Text can’t tell you if the caller sounded annoyed, interrupted, or talked over the agent.
DECIDE tests exactly that, on real production calls.
→ 4,867 decision questions from 1,081 real agent-caller clips (3 to 25 seconds)
→ 32 tasks across 6 families: turn-taking, graph routing, tool decisions, language switching, caller emotion, business intent
Direct-audio models and STT + text models (20 in total) are scored on the same questions, so you can see what audio actually adds, and what it costs in dollars and milliseconds.
Submit your model endpoint and get scored; no invite needed.
Website: benchmark.tazolabs.com/
Samples: huggingface.co/datasets/tazo…
Bengaluru, it’s time to plan your day! 🚀
The agenda for the big day, Symphony: India’s flagship Voice AI Summit, is finally out!
Across Sur and Abhyas, the day runs on two stages at once. Sur, our main stage, brings together the people shaping voice AI in India: global AI labs, founders building speech models for India’s languages, and the investors betting on what comes next. Abhyas, the build stage, is for those who want to see how it all comes together, with product showcases, sessions and the Buildathon finals.
Team @bolna_dev will also be unveiling what our team has been quietly building for months, so do stay for that.
Grab a coffee, pick your sessions, and maybe pack your comfy shoes for running between stages. Link to the full agenda: bolna.ai/symphony/agenda
P.S. You’ll spot a special performance on the agenda, and it’s the part Team Bolna is most excited about. Keeping it under wraps has been killing us, so stay tuned.
Enterprises that answer calls across Ladakh to Kanyakumari or Gujarat to Manipur shouldn't be limited to agents who only know how to answer in one language. Whether it's a bank, a healthcare facility or a national university, the caller on the line deserves an agent that meets them where they are.
The solve? A dedicated prompt for every language.
Except that always becomes too tedious to build with each add-on.
Adapting to voice agents was supposed to make this easier. Instead, adding new languages only meant adding another version of the agent with an additional prompt to write and test, with each linguistic version drifting apart and getting lost in translation.
@bolna_dev's latest update on Canvas takes away that friction for enterprises with just one edit.
Draft your agent’s logic once, and it holds across every language the agent is supposed to speak. Only the lines the agent says out loud change from one language to the next. Bolna translates them automatically, and teams can still fine-tune the wording so it sounds natural to local callers.
Adding a new language takes just a click, and not a rewrite. What you end up with is multiple agents fluent in the language your customers speak without an added effort of a dedicated prompt for each one of them.
Go try your new Canvas on Bolna now!
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Welcome to the ensemble, Sarvam and Vobiz AI.
We’re so excited to have you at Symphony: India’s Flagship Voice AI Summit.
India’s voice AI builders, founders and operators will all be under one roof, so make sure you’re in it too.
Link to get your golden ticket: lnkd.in/p/gf57KzMR
🗓️ November 20, 2026
📍 The Lalit Ashok, Bengaluru
Can you build something without typing a single line?
@WisprFlow and @bolna_dev are teaming up to get builders together for Build Out Loud, a voice only Buildathon, putting this question to test and a lil’ something to get you hyped for Symphony.
Every build you’ve shipped started at a keyboard, this one starts with your voice.
If you have got a blank page staring back at you, we’ve got you, try an AI recruiter, a multilingual support agent, an outbound agent that qualifies leads or a feedback agent that runs surveys.
Link to register: luma.com/1a2rjj9r
🗓️ 15th November | 12 PM to 5 PM
👥 Solo or teams of up to 4
PS: Loud ideas are welcomed, wispr-ed ones even more so!
2 weeks to showtime!
Today we welcome @BizTruecaller , @Exotel and @KalpaLabsAI to the ensemble, joining @GoogleCloud_IN . All four, Diamond Sponsors by tier (precious by nature).
Last week, Mumbai got a glimpse of what Symphony has to offer. Bengaluru, we hope you’re ready for the loudest day voice AI in India has witnessed.
Link to reserve a spot and get the tickets- bolna.ai/symphony
📅 November 20, 2026
📍 The Lalit Ashok, Bengaluru
We’re kicking off Diwali month with something we’ve been excited to share: Bolna Partners Program 🪔
It’s built for agencies, consultants and product teams who want to bring voice AI to their customers.
Here’s how it works, partners deliver Voice AI under their own brand, and we run everything underneath it. You own the customer relationship, the implementation and the support and we handle the infrastructure.
What partners get:
• An API-first platform built for white labeling
• Infrastructure that already handles 1M+ calls a day
• Preferred rates from day one, with no minimum volume to unlock them
We know this model works because it’s already working. 4 of our top 10 customers came to us through partners. Now we’re putting a proper program behind it.
If you’ve been looking for the right Voice AI partner, this is your sign.
Apply here : bolna.ai/partners
join us: luma.com/6uhcmz3l
Build, buy, or wait? What's the right call for voice AI? 🎙️
On Nov 4, we're getting Devansh Ghatak (Co-founder & CTO, @SimplismartHQ) and @xan_ps (Co-founder & CTO, @bolna_dev) together to talk about this.
What's worth building in-house, what makes more sense to buy, and what has changed after running voice AI in production?
Bring your questions too!
📅 Nov 4 | 5–6 PM IST
(registration link shared in comments)
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Build, buy, or wait? What's the right call for voice AI? 🎙️
On Nov 4, we're getting Devansh Ghatak (Co-founder & CTO, @SimplismartHQ) and @xan_ps (Co-founder & CTO, @bolna_dev) together to talk about this.
What's worth building in-house, what makes more sense to buy, and what has changed after running voice AI in production?
Bring your questions too!
📅 Nov 4 | 5–6 PM IST
(registration link shared in comments)
If you’re building an AI voice agent, tweaking it shouldn’t be a two-hour long tedious process that has you spending hours working out what needs to change.
But here’s the good part, you can now hand that tedious part over to AI Edit on @bolna_dev.
Open your Canvas, just point to what doesn’t feel right, and let it do its job.
You'd have your voice agent ready exactly the way you imagined.
Try it on while it’s free in beta, link in threads!
The next set of voices are here.
We’re excited to welcome @DhawanAnuja from @Exotel, @pshishodiaa from @KalpaLabsAI, and @madhkrish from @VahanInc to the panel.
The stage is coming together, and so are the conversations we’ve been waiting for.
Link to get the tickets is in the comments, come catch them live at Symphony on November 20th at The Lalit Ashok!
We said this could be your best shot at a direct interview with @ycombinator .
Then 2,000+ of you pulled up, so the Buildathon had to level up!
Thanks to your response and our Buildathon Partner @plivo , @bolna_dev 's Buildathon has gotten bigger:
• ₹5L in cash prizes (more than double what we started with)
• Top 5 teams pitch live on the Abhyas stage at Symphony, and we’ll fly you to Bengaluru.
• Top 50 teams get complimentary Symphony tickets
• The winner gets an interview with Y Combinator (still the crown jewel)
The clock is ticking faster than ever and there’s only 72 hours left to shoot your shot.
Link to register: bolna.ai/symphony/buildathon
