§ S-05/voice-agent-launch

A voice agent on your phone number. Two weeks.

Vapi or Retell, wired to your CRM, your calendar, your ticketing. One workflow, production-ready. $4,999 flat. HIPAA BAA available.

$4,999fixed fee

2 weeksto live phone number

≤1sfirst-response latency

book the launch █not sure yet? free readiness audit →

Quick verdict

Voice Agent Launch — a 2-week engagement that ships one production voice workflow (intake, qualification, follow-up, or scheduling) on Vapi or Retell, running on your phone number, wired to your CRM / calendar / ticketing (HubSpot, Salesforce, Cal.com, Zendesk, custom). Tuned for sub-second first-response latency, interrupt-safe conversation, natural persona in your brand voice. Ships with call analytics, encrypted transcript storage, and a warm-transfer escalation path to humans for off-script cases. HIPAA BAA path available for healthcare (adds ~$1,500 and coordinates BAAs with every data processor in the call path).

§ 01/workflow-patterns

Five voice workflows we ship most.

Most launches we run fit one of these five shapes. The scoping call maps your specific need to the nearest shape and confirms platform (Vapi vs Retell).

Voice Agent Launch · 5 workflows · Vapi or Retell · HIPAA path available

Workflow	Today	What the launch ships
Inbound calls for lead intake / qualification / scheduling	Reception staff handling 50+ calls/day; same questions every time	Voice workflow: answers in under a second, qualifies, books, syncs to CRM
Outbound follow-up or reminder calls at scale	SDRs spending hours on dials; appointment no-show reminders neglected	Voice workflow: outbound dialer, persona + script, analytics per call
Medical / dental / legal intake with HIPAA requirements	Staff typing intake forms mid-call; PHI handling unclear	HIPAA-compliant voice intake with BAA, transcript encryption, and PHI redaction
After-hours support queue overflowing into the next morning	No 24/7 coverage; voicemails pile up; SLAs slip	Voice agent handles tier-1 issues overnight; escalates to human for anything it can't
Prototype built on raw Twilio + GPT that drifted into a 6-month project	Latency unacceptable, interrupt handling broken, CRM sync never shipped	Vapi or Retell rebuild with sub-second latency, proper interrupt handling, clean CRM sync

§ 02/2-week-schedule

The 2-week voice-launch schedule.

Week 1 ends with the agent answering a test phone number. Week 2 ends with your production number live, analytics wired, transcripts stored, team trained.

W1week 1
Scoping + script + integrations
Week 1 starts with a scoping call where we confirm the one workflow (intake, qualification, follow-up, scheduling) and pick the platform (Vapi = developer-first, Retell = faster to launch). We draft the script, design the persona, and wire the CRM / calendar / ticketing integrations (HubSpot, Salesforce, Cal.com, Zendesk, custom). By end of week 1 the agent answers a test phone number and syncs to your staging CRM.
W2week 2
Voice tuning + analytics + cutover
Week 2 is voice tuning (interrupt handling, latency optimization, persona refinement against real call recordings), call analytics (every call logged with transcript, outcome, and escalation trigger), transcript storage (encrypted, retention-policy configurable), and cutover to your real phone number. Handoff session included so your team can tune prompts and add workflows later.

W1week 1
Scoping + script + integrations
Week 1 starts with a scoping call where we confirm the one workflow (intake, qualification, follow-up, scheduling) and pick the platform (Vapi = developer-first, Retell = faster to launch). We draft the script, design the persona, and wire the CRM / calendar / ticketing integrations (HubSpot, Salesforce, Cal.com, Zendesk, custom). By end of week 1 the agent answers a test phone number and syncs to your staging CRM.
W2week 2
Voice tuning + analytics + cutover
Week 2 is voice tuning (interrupt handling, latency optimization, persona refinement against real call recordings), call analytics (every call logged with transcript, outcome, and escalation trigger), transcript storage (encrypted, retention-policy configurable), and cutover to your real phone number. Handoff session included so your team can tune prompts and add workflows later.

§ 03/sample-config

A sample agent config we ship.

This is the shape of a production HIPAA-compliant intake agent on Vapi — model, voice, transcriber, interrupt threshold, tool webhooks, analytics, compliance coordination. Retell configs look similar with different field names.

vapi-agent/config.ts

typescript

01// vapi-agent/config.ts — production intake agent (trimmed)02export const intakeAgent = {03  model: {04    provider: "anthropic",05    model: "claude-sonnet-4-6",06    systemPrompt: INTAKE_SYSTEM_PROMPT, // cached via cache_control07    temperature: 0.3,08  },09  voice: {10    provider: "elevenlabs",11    voiceId: "brand-voice-v3",12    stability: 0.7,13    similarityBoost: 0.85,14  },15  transcriber: {16    provider: "deepgram",17    model: "nova-3",18    language: "en-US",19    endpointing: 250, // ms silence before end-of-turn20  },21  firstMessage:22    "Thanks for calling Acme Health. I can help schedule, answer questions, or connect you to a human. What can I do for you?",23  interruptionThreshold: 120, // caller can interrupt after 120ms of agent speech24  maxDurationSeconds: 600,25 26  tools: [27    { name: "check_availability", webhook: "/api/cal/slots" },28    { name: "book_appointment", webhook: "/api/cal/book" },29    { name: "escalate_to_human", webhook: "/api/twilio/transfer" },30  ],31 32  analytics: {33    endOfCallReport: true,34    sentimentScoring: true,35    summaryDestination: "salesforce_task",36    transcriptStorage: "encrypted_s3_with_30d_retention",37  },38 39  compliance: {40    hipaa: true,41    baaSignedWith: ["vapi", "elevenlabs", "deepgram", "anthropic"],42    phiRedactionOnTranscript: true,43  },44};

Every field here is something we tune against real recordings — sub-second latency is a product of dozens of these choices.

§ 04/ledger

What the launch delivers.

Five deliverables. Your phone number. Your CRM. Your brand voice.

01One production voice workflow (intake, qualification, follow-up, or scheduling)
02Vapi or Retell deployment on your phone number
03CRM / calendar / ticketing integration (HubSpot, Salesforce, Cal.com, Zendesk, custom)
04Call analytics + transcript storage + escalation path to human
05Prompt + persona design tuned to your brand voice

§ 05/engagement-price

Fixed fee. One workflow. HIPAA path add-on.

One workflow per launch. Adding a second workflow after the first goes live is a $1,999 add-on (less scope overlap; cheaper than starting fresh). HIPAA BAA coordination adds $1,500.

voice

price

$4,999

turnaround: 2 weeks
scope: Vapi or Retell · 1 workflow · CRM sync · analytics · transcript storage · escalation
guarantee: Sub-second first-response latency. HIPAA BAA path available.

book the launch→

§ 06/vs-alternatives

Voice Agent Launch vs IVR vs call center vs DIY Twilio.

Four dimensions. The lime column is what you get when you buy a fixed-price Vapi or Retell launch instead of wrestling with press-one trees or a 6-month DIY Twilio build.

Voice Agent Launch · sub-second latency · HIPAA path · 2-week launch

Dimension	Traditional IVR	Call center	DIY Twilio + GPT	Afterbuild Labs launch
Approach	Traditional IVR	Human call center (outsourced)	DIY Twilio + GPT	Afterbuild Labs Voice Agent Launch
Price	$0.50–$2/call + brittle tree setup	$8–$25/hour/agent, 24/7 staffing	6-month build + maintenance	$4,999 fixed · 2 weeks · marginal cost per minute
Caller experience	Press 1 for… universally hated	Good — when you can afford enough agents	Latency problems, interrupts broken	Sub-second latency · interrupt-safe · natural
Compliance	PCI yes; HIPAA rare	Depends on vendor	You build the compliance layer	HIPAA BAA path · transcript encryption · PHI redaction

§ 07/fit-check

Who should book the launch (and who should skip it).

Book the launch if…

→You have one high-volume voice workflow (intake, qualification, reminder, scheduling, tier-1 support) and a phone number.
→Your team takes 20+ calls per day that are mostly repetitive and would benefit from AI coverage.
→You need HIPAA BAA coverage (healthcare, dental, mental health, home health).
→You need 24/7 coverage without a 24/7 staffing budget.
→You want a production voice agent, not a demo — with CRM sync, analytics, and human escalation.

Do not book the launch if…

→You need 5+ different voice workflows at launch — book a custom engagement, not a single-workflow launch.
→You need a multimodal agent (voice + chat + email) — book the AI Agent MVP ($9,499) instead.
→You need a compliance framework (SOC 2 Type II audit) as part of the build — that's a separate engagement.
→You want to keep a human in every call loop — the launch is for workflows where humans only handle escalations.
→Your call volume is under 100 calls/month — the per-minute cost is fine but the ROI is thin on the build.

§ 08/launch-faq

Voice Agent Launch — your questions, answered.

FAQ

Which platform should we pick — Vapi or Retell?

Depends on priorities. Vapi is developer-first (more control over prompts, tools, webhooks, transport; better for complex multi-tool workflows). Retell is faster to launch (more opinionated defaults, stronger out-of-the-box analytics, better for straightforward intake / scheduling). We make the call on the Day-1 scoping based on your workflow complexity, engineering team bandwidth, and compliance requirements.

What kind of latency can I expect?

Sub-second first-response latency on the tuned build. Typical latencies: transcription (Deepgram Nova-3) 200–300ms, model inference (Claude Sonnet or GPT-5-mini) 400–700ms, TTS (ElevenLabs or Cartesia) 100–200ms. Total: ~800–1200ms end-to-end per turn. Users perceive this as conversational; above 1.5 seconds it starts to feel robotic. We tune specifically to stay under that threshold.

Does the voice agent support languages other than English?

Yes. Vapi and Retell support 30+ languages via Deepgram / AssemblyAI transcription and ElevenLabs / Cartesia TTS. Non-English builds typically add a day to the timeline for voice selection and persona tuning. Common adds: Spanish (LatAm / Castilian split), French (Canadian / European split), German, Portuguese (BR), Mandarin. Confirm on scoping.

How does the HIPAA path work?

HIPAA-compliant voice agents require BAAs with every data processor in the call path — typically Vapi (or Retell), the TTS provider (ElevenLabs has a BAA), the STT provider (Deepgram has a BAA), and the LLM provider (Anthropic via AWS Bedrock, or OpenAI via Azure). We coordinate BAA execution, enable transcript encryption at rest, configure PHI redaction on stored transcripts, and set a retention policy (typically 30 days). HIPAA adds ~$1,500 to the engagement to cover BAA coordination and compliance review.

What does it cost to run after the sprint?

Voice-agent ongoing cost is measured in per-minute. Typical production cost: $0.10–$0.30 per conversation minute across Vapi / Retell platform fee, LLM, TTS, STT. A 5-minute call costs roughly $0.50–$1.50. Compare that to $2–$4 for a human agent on the same call at $25/hr. Volumes over 500 conversation-minutes/day often justify a self-hosted / enterprise discount path — we map that out in the handoff.

Can the agent handle off-script questions?

Yes. We build agents with an explicit escalation path — the agent decides when it's outside its remit (based on a confidence score, tool-use failure count, or an explicit 'speak to a human' request) and warm-transfers to a human via Twilio SIP. Transcripts of the first half of the call land in the CRM so the human picks up with context, not a blank slate.

§ 09/adjacent-services

Related build engagements

Related audits

Next step

Launch the voice agent. Two weeks.

Two weeks. $4,999 fixed. One production voice workflow on Vapi or Retell, live on your phone number, tuned for sub-second latency, wired to your CRM, with HIPAA path available.

Book free diagnostic →