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Ab Singh
AI Automations, Agents & Systems
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AI voice agents I’ve built
Phone agents that do the job — book, refund, dispatch — not just talk. Each runs on real tools.
~0.6 s to first word
E-commerce support line
Answers in about a second, verifies the order, refunds up to 30% itself, hands the rest to a senior.
Retell
OpenAI
n8n
Patient calls
Verify or qualify
Check calendar
Find patient
Book + text
Bilingual
Clinic receptionist, EN + ES
Books consults with the right surgeon, verifies patients, and escalates post-op red flags.
Vapi
Retell
n8n
Form submitted
Agent calls back
Offer 2 slots
Book + text
Callback later
Log outcome
10/10 test calls
Outbound speed-to-lead
Calls a new gym lead right after they fill the form, books the free assessment, texts the details.
Vapi
Retell
n8n
Fault reported
Check contract
Triage P1–P3
Dispatch engineer
Book visit
Duty manager
15/15 edge-case tests
24/7 service desk
Takes fault calls for a fire and security firm, sets priority by impact, dispatches the on-call engineer.
Vapi
n8n
✕
E-commerce support line
Starts when
A customer calls the support line.
Does
Looks up and verifies the order, then cancels, re-ships, changes the address or refunds within policy.
Result
Most calls resolved on the call; the rest arrive as a finished ticket.
10
actions it can take
30%
refund limit, then a human
Retell
OpenAI
n8n
Call it yourself →
✕
Patient calls
Verify or qualify
Check calendar
Find patient
Book + text
Clinic receptionist, EN + ES
Starts when
A new or existing patient calls.
Does
Matches procedure to surgeon, books from real availability, verifies by phone + date of birth.
Result
Consults booked and texted; urgent post-op calls routed to the on-call surgeon.
4
providers scheduled
2
languages
Vapi
Retell
n8n
✕
Form submitted
Agent calls back
Offer 2 slots
Book + text
Callback later
Log outcome
Outbound speed-to-lead
Starts when
A lead submits the website form.
Does
Asks about their goal, handles objections, offers two real slots, books one.
Result
A booked assessment while the lead is still warm.
10/10
simulated calls pass
5
tools
Vapi
Retell
n8n
✕
Fault reported
Check contract
Triage P1–P3
Dispatch engineer
Book visit
Duty manager
24/7 service desk
Starts when
A customer reports a fault, day or night.
Does
Checks contract cover, triages P1–P3, picks a qualified engineer, books visits and surveys.
Result
Urgent faults dispatched in minutes; nothing confirmed that didn’t really happen.
8
tools
39/39
live tool results pass
Vapi
n8n
