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

Bolti is a voice AI platform for production phone agents — and one of its most practical applications is voice bot pre screening: automatically calling job candidates, asking structured questions, and returning structured results to your team. At ₹7/min pay-as-you-go, it costs less than a single recruiter hour to screen dozens of applicants.

What is voice bot pre screening?

Voice bot pre screening is an automated phone interview where a voice AI calls a candidate, asks a predefined set of questions, listens to the answers, and records a structured summary — without a human recruiter on the line. It sits at the top of the hiring funnel, filtering hundreds of applicants down to a shortlist before a recruiter spends a minute on the phone.

The bot handles the repetitive, time-consuming work: confirming availability, checking notice period, verifying basic qualifications, and asking role-specific questions. A recruiter reviews the output, not the raw calls.

How does a voice bot work in a hiring context?

A voice bot in hiring works by combining four components: speech-to-text (STT) to transcribe what the candidate says, a large language model (LLM) to decide what to ask next, text-to-speech (TTS) to speak the agent's words, and telephony to carry the call. Bolti wires all four together with sub-second turn-taking so conversations feel natural, not robotic.

Here is the sequence during a typical pre screening call:

1. Outbound dial — Bolti calls the candidate at a scheduled time or when they self-book a slot via a link.
2. Introduction — the agent introduces itself, states the role, and asks if this is a good time.
3. Structured questions — the agent works through your custom question list: notice period, current CTC, relevant experience, availability for next rounds.
4. Clarification — if an answer is vague, the agent follows up naturally ("Could you tell me more about that project?").
5. Close — the agent thanks the candidate and explains next steps.
6. Summary delivery — a structured transcript and summary land in your dashboard.

Bolti's STT layer includes Fennec, which is optimised for Indian accents and languages like Hindi, Tamil, and Telugu — a meaningful difference when your candidate pool is pan-India.

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

A screening bot is any automated system that evaluates candidates before a human recruiter engages. A voice screening bot does this over a phone call rather than a form or chatbot. The key advantage is that spoken answers carry tone, fluency, and confidence that a typed form cannot.

Good voice bot pre screening questions fall into three categories:

Knockout filters (quick yes/no checks):

• Are you currently eligible to work in [location]?
• What is your current notice period?
• Are you open to [on-site / hybrid / remote]?

Experience probes (open-ended, role-specific):

• Walk me through your most recent project in [relevant skill].
• Have you managed a team before? How large?
• What is your experience with [specific tool or technology]?

Motivation and fit:

• Why are you looking to move from your current role?
• What do you know about our company?
• What are your salary expectations?

On Bolti, you add these as custom questions inside the HR Screening module. Each question becomes a bullet inside the {{ custom_questions }} variable that the agent reads during the call — so every candidate in a role gets the same screen, in the same order.

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

Bolti's HR Screening module, found under Agents → HR Screening in the dashboard, turns a job description and a stack of CVs into structured phone screens with no spreadsheet glue.

Step-by-step setup

1. Create a role — add a title and paste your full job description. The agent uses the JD verbatim during the call.
2. Add custom questions — list the specific questions you want asked for this role.
3. Pick a screening agent — choose from your workspace agents. Bolti checks the prompt for four required variables: {{ candidate_name }}, {{ jd_text }}, {{ custom_questions }}, and {{ candidate_details }}.
4. Upload CVs — Bolti parses each CV, extracts key details, and lists candidates in the role.
5. Reach out — schedule outbound calls for a specific time, or send candidates a self-booking link via email or WhatsApp. Bolti calls them when the slot arrives.
6. Review results — the candidates table updates live as calls complete, showing status from link_sent through call_completed.

You can preview any agent in your browser before going live — no phone required. The preview runs on the same real-time stack as production calls, so what you hear is what candidates will hear.

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

Candidates increasingly search for tips on passing AI screening calls. Understanding their perspective helps you design a better screening flow.

From the candidate's side, the advice is simple: speak clearly, answer the question asked, give specific examples rather than vague claims, and do not rush. The voice bot will wait for a natural pause before responding — candidates who speak in complete sentences score better transcripts.

From your side as a recruiter or ops lead, this means:

• Write clear questions. Ambiguous questions produce ambiguous answers that are hard to evaluate.
• Set expectations upfront. Tell candidates in the scheduling message that they will receive an automated call. Drop-off and confusion both fall sharply when candidates know what to expect.
• Keep the call under 10 minutes. Completion rates drop for longer screens. Five to seven focused questions is usually enough to qualify or disqualify.
• Review transcripts, not just scores. A structured summary is a starting point. Unusual answers deserve a human listen.

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

Factor	Human recruiter call	Voice bot pre screening
Cost per call	₹150–500 (recruiter time)	₹7/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 in parallel
Candidate experience	Personal, flexible	Structured, predictable
Output format	Notes in ATS	Structured transcript + summary

Voice bots do not replace recruiters for final-round interviews or complex role negotiations. They replace the first 15 minutes of a recruiter's call that exists only to confirm basic facts.

For more examples of how teams use Bolti across hiring and other workflows, see the Bolti use cases and case studies.

Set up your first voice bot pre screening agent

You can have a working pre screening agent live in under 10 minutes. Bolti's free trial includes 50 minutes — enough to run full test screens on several candidates before you spend a rupee. After that, calls are billed at ₹7/min with no monthly minimums.

Upload your JD, add five knockout questions, and let Bolti call your next batch of applicants — start your free pre screening trial and see structured results in your dashboard the same day.

Frequently Asked Questions

What is voice bot pre screening?

Voice bot pre screening is an automated phone interview where an AI calls job candidates, asks structured questions, and returns a transcript and summary to your team — without a human recruiter on the line. It filters large applicant pools quickly before a recruiter invests time.

How does a voice bot work for hiring?

A voice bot combines speech-to-text, a large language model, text-to-speech, and telephony. It calls the candidate, transcribes their answers in real time, decides what to ask next based on the conversation, and speaks responses naturally. Bolti adds sub-second turn-taking and interruption handling so the call feels like a real conversation.

What questions should a voice bot ask in a pre screening call?

Focus on three types: knockout filters (notice period, location eligibility, work mode preference), experience probes (specific projects, team size, tool experience), and motivation questions (reason for leaving, salary expectations). Keep the total to five to seven questions so the call stays under 10 minutes.

How much does voice bot pre screening cost on Bolti?

Bolti charges ₹7/min pay-as-you-go with no monthly minimum. A 7-minute pre screening call costs under ₹50. New accounts get 50 free minutes to test the full flow before any charges apply.

Can a voice bot screen candidates in Hindi or other Indian languages?

Yes. Bolti supports 80+ languages including Hindi, Tamil, Telugu, Marathi, Bengali, and Gujarati. The STT layer includes Fennec, which is specifically optimised for Indian accents and regional languages, improving transcription accuracy on pan-India candidate pools.