Telephony
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Vobiz telephony for Bolna AI voice agents

Vobiz gives a Bolna voice agent Indian phone numbers for inbound and outbound calls. Buy a Vobiz number in Bolna after KYC, or connect your own account.

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At a glance

How Vobiz fits in the stack

Best for

Making and receiving real phone calls at production scale.

Use this layer when

You need numbers, trunking, call routing, or carrier control.

Connects to

STT, LLM, TTS, and workflow actions inside the live call.

Voice Stack

Telephony is the calling layer

Telephony is the calling layer

This provider connects Bolna to the phone network. It controls how calls start, where they route, which numbers you use, and how the audio enters your agent pipeline.

TelephonyPhone Network
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STTListener
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LLMReasoning
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TTSVoice
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ToolsActions

Last updated

What is Vobiz used for in a Bolna voice agent?

Vobiz is an Indian telephony provider that lets a Bolna voice agent make outbound calls and answer inbound calls on Vobiz phone numbers, either bought in Bolna or from your own Vobiz account. Pick Vobiz for calling within India, especially if you need 140-series numbers for telemarketing.

How do I set up Vobiz with Bolna?

  1. Get a number. To buy one, submit KYC from the Vobiz KYC tab in Organisation settings, then go to platform.bolna.ai/phone-numbers, choose India and Vobiz, pick a region and subscribe. To use your own account instead, go to Settings, then Integrations, filter by Telephony and click Connect on the Vobiz card.
  2. Open your agent's Calling tab, set the telephony provider to Vobiz and save.
  3. For outbound calls, enter recipient numbers in the dashboard or call the Bolna call API with your agent ID.
  4. For inbound calls, turn on Inbound Calling in the Calling tab, pick your Vobiz number from the Inbound number dropdown and save the agent.

More detail: Vobiz setup guide in the Bolna docs.

Which numbers and features does Bolna support with Vobiz?

FeatureVobiz on Bolna
Supported countryIndia
Outbound callsYes
Inbound callsYes
Bring your own Vobiz accountYes
Buy a number in BolnaYes, after KYC approval, $5 per month
140-series (telemarketing) numbersYes, after DLT registration
Ambient background noiseYes (Plivo and Vobiz)
Keypad input (DTMF)Not supported yet
IVR menusNot supported (Plivo only)

For 160-series transactional numbers or IVR menus, use Plivo. Number rent is separate from per-minute call costs; see pricing.

What can you build with Vobiz and Bolna?

Telemarketing campaigns on 140-series numbers. Run DLT-registered promotional calls in India with an AI agent, and scale them with batch calling.

Call center style outbound. Add an office or call-center ambient track so calls sound like they come from a real desk rather than a silent line.

Inbound support in Hindi and English. Assign a Vobiz number to an agent so it answers customer questions, books appointments or qualifies leads.

Moving existing Vobiz numbers to AI. Connect the Vobiz account you already use, so customers keep calling and seeing the same numbers.

FAQ

Vobiz on Bolna: frequently asked questions

Vobiz numbers need KYC approval first. Until it's approved, the buy dialog shows a "KYC required for VoBiz numbers" banner. Submit KYC from the Vobiz KYC tab in Organisation settings, and the available regions appear once it's approved.

Yes. Bolna uses Vobiz for 140-series promotional and telemarketing numbers. You first register as a Principal Entity on the TATA Teleservices DLT portal, which Vobiz recommends.

Yes. Go to Settings, then Integrations, filter by Telephony and click Connect on the Vobiz card. After that, calls go out from your own Vobiz account and phone numbers.

Not yet. DTMF is supported on Plivo and Twilio. Vobiz does support ambient background noise on calls, along with Plivo.

Browse this layer

Keep exploring the voice stack

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Telephony

Telephony providers connect your voice agents to the phone network so they can make and receive real calls. Bolna supports managed integrations with major carriers as well as bring-your-own-carrier via SIP trunking, giving you full control over call routing, number provisioning, and cost.

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Large Language Models

The LLM is the brain of your voice agent. It understands what callers say and decides how to respond. Bolna lets you switch between models like GPT-5.4 mini, Claude and DeepSeek by changing the provider and model in your agent LLM settings, so you can tune for speed, cost or reasoning depth.

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Speech-to-Text

Speech-to-text converts what callers say into text that your LLM can process. Transcription accuracy and latency directly affect how natural a conversation feels. Bolna supports streaming STT providers optimized for telephony audio, including specialized models for Indian languages.

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Text-to-Speech

Text-to-speech turns your agent responses into spoken audio. Voice quality shapes how callers perceive your brand. Flat, robotic speech kills trust while natural, expressive voices build it. Bolna integrates with the fastest TTS providers so responses sound human and arrive without awkward pauses.

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Tools & Workflows

Tools let your voice agents take action during a call, not just talk. Book a calendar slot, look up an order through your own API, push a lead into your CRM, or trigger a multi-step automation in Zapier. These integrations turn voice agents from answering machines into workflow engines.

See where Vobiz fits in your production workflow

Use the demo to walk through provider selection, stack tradeoffs, and the exact workflow you want Bolna to automate.