Voice Bot Pre Screening: How It Works and Why It Saves Time

Voice bot pre screening is the automated process of using AI voice agents to conduct initial phone interviews with job candidates, verifying qualifications and notice periods before human recruiters step in. Bolti, a voice AI platform for building production-ready conversational phone agents, offers this capability through its dedicated HR Screening module, allowing you to screen dozens of applicants for just ₹6/min with a 50-minute free trial.

What is voice bot pre screening and why should you use it?

Voice bot pre screening is an automated phone call where an AI agent interviews job applicants, asks structured questions, and delivers structured summaries to your team. It sits at the top of your hiring funnel, filtering hundreds of resumes down to a qualified shortlist without a human recruiter spending a single minute on the phone.

For high-volume hiring in Indian cities like Bengaluru, Mumbai, or Delhi, recruiters are often overwhelmed by hundreds of applications for a single role. Instead of manually dialing candidates to verify basic details, a voice bot handles the repetitive work. It confirms:

• Notice periods and current CTC
• Relational or technical qualifications
• Location preferences (on-site, hybrid, or remote)
• Immediate availability for subsequent rounds

How does a voice bot work in a hiring context?

A voice bot works by combining speech-to-text (STT) to transcribe spoken answers, a large language model (LLM) to determine the next question, text-to-speech (TTS) to speak, and telephony to route the call. Bolti coordinates these four layers to deliver sub-second turn-taking and natural, human-like interruption handling.

When a candidate answers the phone, the interaction follows a structured sequence:

1. Outbound dial — Bolti initiates the call at a scheduled time or when a candidate self-books a slot.
2. Introduction — the agent introduces itself, references the specific job role, and confirms it is a good time to speak.
3. Structured screening — the agent runs through your custom question list, maintaining a consistent order for every candidate.
4. Natural follow-ups — if a candidate's answer is vague, the LLM-powered agent asks clarifying questions (e.g., "Could you tell me more about your experience with Go?").
5. Call wrap-up — the agent thanks the candidate, outlines the next steps, and hangs up.
6. Structured delivery — a complete transcript, audio recording, and LLM-summarized bullet points land directly in your dashboard.

Unlike general-purpose platforms or legacy systems like Bolna AI and Ringg AI, Bolti uses specialized STT models like Fennec, which are optimized for Indian accents and multilingual conversations in Hindi, Tamil, Telugu, Marathi, and Gujarati.

What is a screening bot and what questions should it ask?

A screening bot is an automated voice agent designed to evaluate candidates' basic fit before human recruiters schedule deep-dive interviews. To maximize completion rates, your questions should focus on objective knockout criteria, core experience probes, and clear logistical constraints.

To build an effective screening flow, organize your questions into three distinct categories:

• Knockout filters: "What is your current notice period?", "Are you open to working on-site in Bengaluru?", "Do you have a valid work authorization?"
• Experience probes: "Walk me through your most recent project using React.", "Have you managed an on-call rotation before?", "What is your experience with Kubernetes?"
• Logistics and expectations: "What are your salary expectations?", "Are you comfortable with a rotating night shift?"

Inside Bolti's HR Screening module, you add these questions as a free-form list. Each question is automatically injected into the {{ custom_questions }} variable, ensuring every applicant receives an identical, unbiased screening experience.

How do you choose the right voice for your screening bot?

You choose your screening bot's voice in Bolti's Voice tab, which features a curated grid of preview-able voice cards from leading low-latency TTS providers. Selecting a voice that matches your target candidate pool's language and region significantly improves call completion rates and candidate trust.

Bolti supports multiple industry-leading text-to-speech (TTS) providers, which you can configure per agent:

• SarvamAI: Offers highly natural Indian-language voices (like Anushka) optimized for regional accents and multilingual conversations.
• Cartesia: Powered by the Sonic-3 model, providing ultra-low-latency, professional voices (like Blake or Daniela).
• ElevenLabs: Uses the Eleven Turbo v2.5 model for ultra-realistic, expressive voices (like Alice, Chris, or Sarah).

You can filter voices by gender, language, or provider, and click the play button on any card to stream a 3-second preview in the voice's native language before deploying.

How does Bolti's HR screening module work end to end?

Bolti's HR Screening module, located under Agents → HR Screening in the dashboard, automates the entire screening pipeline from resume parsing to outbound calling. It maps candidate data directly to your voice agent using four required template variables to ensure highly personalized conversations.

Setting up the pipeline takes just a few steps:

1. Create a role: Enter the job title and paste the full job description. The agent uses this text verbatim during the call.
2. Configure the agent: Select your screening agent and ensure its prompt contains the four required Jinja-style template variables:
   • {{ candidate_name }}: Extracted from the parsed CV.
   • {{ jd_text }}: The role's job description.
   • {{ custom_questions }}: Your list of screening questions.
   • {{ candidate_details }}: LLM-summarized bullet points from the resume.
3. Upload candidate CVs: Drag and drop PDFs or Word documents. Bolti parses the resumes, extracts contact details, and generates refined pointers.
4. Initiate outreach: You can schedule outbound calls for a specific date and time, or send a self-booking link via email or WhatsApp so candidates can choose when Bolti calls them.
5. Track live status: Monitor the candidates table as status updates in real-time from link_sent to call_scheduled and finally call_completed.

How do you test your screening agent before calling candidates?

You can test your screening agent instantly using Bolti's Preview tab, which allows you to talk directly to your agent through your browser using your laptop's microphone and speakers. This lets you iterate on prompts, voices, and questions in real-time without incurring any telephony charges.

The Preview tab runs on the exact same real-time stack that powers production phone calls. The only difference is the audio source:

• Production calls: Audio routes through your SIP trunk (like Twilio, Plivo, or Exotel).
• Preview calls: Audio routes directly through your browser's microphone and speakers.

To use it, open your agent's detail page, click the Preview tab, click Connect, and grant microphone permissions. The preview is fully isolated per session, meaning disconnecting clears the conversation history so you can start fresh.

How to pass an AI screening test as a candidate (and what that means for you as a recruiter)?

Candidates passing an AI screening test succeed by speaking clearly, answering questions directly, and avoiding rush. For recruiters, understanding this behavior means you must design clear questions, set upfront expectations, and keep calls short to ensure high-quality data collection.

As candidates adapt to voice bot pre screening, recruiters must optimize the experience:

• Set expectations early: Inform candidates via email or WhatsApp that they will receive an automated call from an AI assistant. This reduces drop-offs and confusion.
• Keep calls under 10 minutes: Completion rates drop sharply for longer calls. Stick to 5 to 7 highly focused questions.
• Write unambiguous questions: Clear prompts yield structured, easy-to-evaluate answers.
• Review transcripts, not just scores: While Bolti provides structured summaries, you should listen to or read the full transcript for candidates with borderline scores.

Voice bot pre screening vs. a human recruiter call: a quick comparison

While human recruiters are essential for final-round negotiations and cultural fit, voice bots excel at handling high-volume, repetitive initial screens. A voice bot operates 24/7, scales instantly to hundreds of concurrent calls, and costs a fraction of a recruiter's hourly wage.

Factor	Human recruiter call	Voice bot pre screening
Cost per call	₹150–500 (recruiter time)	₹6/min (Bolti pay-as-you-go)
Availability	Business hours only	24/7
Consistency	Varies by recruiter	Identical every call
Scale	10–20 calls/day per recruiter	Hundreds of parallel calls
Candidate experience	Personal, flexible	Structured, predictable
Output format	Manual notes in ATS	Structured transcript + summary

By automating the first 10 minutes of the hiring process, your recruitment team can focus entirely on interviewing qualified, pre-screened candidates. To see how other teams have optimized their hiring funnels, explore our Bolti use cases and case studies.

Set up your first voice bot pre screening agent

Spin up your first HR-screening voice agent in under 10 minutes. Bolti's free trial includes 50 minutes of call time, allowing you to run comprehensive test screens on several candidates before spending a rupee. Once you are ready to scale, calls are billed at a transparent ₹6/min pay-as-you-go rate with no monthly minimums or hidden fees.

Upload your job description, add your custom knockout questions, and let Bolti call your next batch of applicants. Start your free pre screening trial and see structured results in your dashboard today.

Frequently Asked Questions

What is voice bot pre screening?

Voice bot pre screening is an automated phone interview where an AI voice agent calls a job candidate, asks a structured set of questions, listens to the answers, and delivers a structured summary and transcript to the hiring team without a human recruiter needing to be on the call.

How much does voice bot pre screening cost?

With Bolti, voice bot pre screening costs ₹6 per minute on a pay-as-you-go basis with no monthly minimums. You also get 50 free minutes when you sign up to test the platform.

Can candidates interrupt the voice bot during the call?

Yes. Bolti is built for production-grade phone calls and features real-time interruption handling and sub-second turn-taking, allowing candidates to speak naturally and interrupt the agent just like they would a human.

Which languages does Bolti support for screening?

Bolti supports over 80 global languages and is optimized for Indian languages including Hindi, Marathi, Tamil, Telugu, Bengali, Gujarati, and English using specialized STT models like Fennec and TTS providers like SarvamAI.

How do I test my screening agent before calling candidates?

You can use Bolti's Preview tab to talk directly to your agent from your browser using your laptop's microphone and speakers. This runs on the same real-time stack as production calls, allowing you to iterate on prompts and voices for free.