How to Switch from Vapi, Retell, or Synthflow to Trillet (Migration Guide)

Switching voice AI platforms takes less time than most agencies expect. Agent recreation on Trillet takes roughly 5 minutes per client using website scraping, call forwarding transfers in about 30 seconds per number, and you can run both platforms in parallel during the transition. Agencies migrating from Vapi or Retell eliminate developer dependency entirely. Agencies leaving Synthflow drop from $1,250/month or unpredictable pay-as-you-go costs to a flat $299/month with $0.12/minute usage. Agencies outgrowing GHL's built-in voice AI or wrapper platforms like Voicerr and Vapify gain native infrastructure with HIPAA, SOC 2, GDPR, and TCPA compliance included at no extra cost.

This guide covers platform-specific migration paths, a step-by-step checklist, what transfers and what does not, and how to run a parallel transition that keeps every client live throughout the switch.

Why Agencies Switch Voice AI Platforms

Agencies leave their current voice AI platform for five recurring reasons: pricing instability, reliability failures, compliance gaps, wrapper dependency risks, and outgrowing limited platforms. The trigger is rarely a single event. It is usually a pattern of problems that compound until the cost of staying exceeds the cost of switching.

Pricing instability is the most common driver. Synthflow scrapped its legacy $1,400/month agency plan in favor of pay-as-you-go pricing where costs become unpredictable at scale. Voicerr raised prices from $28/month to $199-$299/month in early 2026, a 7-10x increase that eliminated the cheap wrapper entry point overnight. Vapi's modular billing can produce five separate invoices per deployment, and total costs only reveal themselves after the call is complete.

Reliability and support failures hit agencies where it hurts most: client trust. Wrapper platforms inherit every outage from their underlying providers. When Vapi goes down, every Vapify agency goes down with it. When Retell has issues, Voicerr agencies have no direct path to resolution. They file a ticket with the wrapper, which files a ticket with the provider, which prioritizes its own direct customers first.

Compliance gaps lock agencies out of the most profitable verticals. Healthcare practices require HIPAA. Financial services need SOC 2. As of June 2026, Voicerr, Vapify, and most wrapper platforms publish no compliance certifications. An agency that signs a dental group or law firm without verified compliance is carrying liability it cannot insure against.

Outgrowing GHL's built-in voice AI affects agencies that started with GoHighLevel's Conversation AI V3. GHL's native voice feature works for basic call handling, but agencies scaling past a handful of clients run into limited customization, no white-label branding, and no multi-agent orchestration. Dedicated voice AI platforms exist because CRM-embedded voice features are a checkbox, not a product.

Migrating from Vapi or Retell (Developer Platforms to No-Code)

Vapi and Retell are developer infrastructure platforms. They provide raw APIs, SDKs, and modular pricing that requires engineering resources to build on. Trillet is a complete agency operating system with a no-code agent builder, white-label dashboards, and client management tools. The migration eliminates developer dependency entirely.

What Changes (as of June 2026)

Migration Steps

1. Export your agent configurations. Document the prompts, knowledge bases, voice settings, and call flows you have built on Vapi or Retell. There is no automated export between platforms. Copy them manually into a document.

2. Recreate agents on Trillet. For each client, paste their website URL into Trillet's agent builder. The platform scrapes the site plus reviews and social media to auto-build a knowledge base. Add any custom prompts or specific instructions from your Vapi/Retell configuration. This takes roughly 5 minutes per agent versus the hours or days of development the original build required.

3. Redirect call forwarding. Your clients already forward calls to a phone number. On Trillet, each client gets an agent number. Update the forwarding destination from the old Vapi/Retell number to the new Trillet number. This takes about 30 seconds per client and requires no changes to the client's business phone number.

4. Test each agent. Place 3-5 test calls per agent covering common scenarios: appointment booking, after-hours inquiries, FAQ questions, and edge cases specific to the client's industry. Trillet includes call recordings and transcripts for review.

5. Update your billing. If you built custom billing on Vapi/Retell, switch to Trillet's native Stripe integration. Set per-minute markups directly in the platform. Your clients see your brand and your invoice, not Trillet's.

What to do: Budget one day for migrating 10-15 clients. The heaviest lift is recreating custom prompts, not the technical setup. Agencies that previously spent weeks on Vapi/Retell builds are consistently surprised by the speed. For a detailed feature-by-feature breakdown of what you gain and lose, see the Trillet vs Retell vs Vapi comparison for agencies.

Migrating from Synthflow (Pricing Chaos to Predictable Costs)

Synthflow's agency plan cost $1,250-$1,400/month before it was phased out for new subscribers in favor of pay-as-you-go pricing. As of June 2026, new Synthflow users face per-minute costs of $0.09-$0.20+ depending on their stack choices, with no fixed agency plan available. Trillet's Agency plan is $299/month with $0.12/minute usage, unlimited sub-accounts, and all compliance certifications included.

Cost Comparison at Scale

Synthflow's pay-as-you-go numbers look lower in isolation, but they do not include the cost of a separate CRM ($100-$300/month additional), no white-label dashboard, and no agency management tools at the basic tier. Trillet's $299/month includes the platform, unlimited sub-accounts, custom domain, branded dashboards, and native CRM integrations. At 20+ clients, the total cost of ownership typically favors Trillet.

Migration Steps

1. Document your Synthflow flows. Synthflow uses a visual flow builder. Screenshot or document each decision path, prompt, and action node. Trillet uses dynamic conversation architecture rather than rigid flows, so you will not be recreating the exact same structure. Instead, you will describe the agent's behavior in natural language, and Trillet's dynamic engine handles branching and backtracking automatically.

2. Recreate agents using website scraping. Paste each client's URL into Trillet's builder. Supplement with the custom prompts and business rules from your Synthflow flows. Trillet's agents can backtrack mid-conversation, something Synthflow's flow architecture cannot do once a decision node is passed.

3. Switch call forwarding. Same process as any platform: update the forwarding number on each client's phone to point to their new Trillet agent number. About 30 seconds per client.

4. Test thoroughly. Synthflow's flow-based agents and Trillet's dynamic agents handle conversations differently. Test edge cases where the caller changes direction mid-conversation, asks an unexpected question, or needs to go back to a previous topic. These are the scenarios where Trillet's dynamic architecture performs differently than Synthflow's linear flows.

5. Cancel Synthflow after parallel period. Run both platforms for 7-14 days. Once you confirm Trillet agents are performing at least as well, cancel Synthflow.

Migrating from Wrapper Platforms (Voicerr, Vapify, VoiceAIWrapper)

Wrapper platforms add a white-label dashboard on top of Vapi or Retell's infrastructure. They do not control the underlying voice AI. Migrating to Trillet replaces a multi-vendor dependency chain with a single native platform. One provider, one support channel, one point of accountability.

The Structural Problem Wrappers Create

A wrapper stack has five or more potential failure points: the wrapper layer, the voice AI provider (Vapi/Retell), the LLM provider, the TTS provider, and the telephony layer. If any single layer has 99.5% uptime, five layers compound to roughly 97.5% effective uptime, or over 18 hours of potential downtime per month. When something breaks, the agency cannot fix it. The wrapper files a ticket with Vapi. Vapi works on it when they get to it. The agency waits.

Voicerr's price increase from $28 to $199-$299/month in early 2026 made the wrapper value proposition even harder to justify. At $299/month, Voicerr costs the same as Trillet's Agency plan but without native infrastructure, without published compliance certifications, and without direct engineering support.

Migration Steps

1. Inventory your current agents. Most wrapper platforms let you export or copy agent configurations. If not, document prompts and settings manually.

2. Recreate on Trillet. Same 5-minute website scraping process. The prompts you wrote for Vapi/Retell (through the wrapper) will transfer directly since Trillet uses the same natural-language instruction format.

3. Move call forwarding. Update each client's forwarding number to the new Trillet agent number.

4. Update client-facing branding. Trillet's Agency plan includes custom domain, logo, and branded dashboards. Set these up before switching clients over so the transition is invisible from their perspective.

5. Decommission the wrapper. Cancel the wrapper subscription. If you were paying Vapi or Retell directly, cancel those accounts too. You now have one invoice instead of two or three.

What to do: The migration from wrappers is typically the simplest because wrapper agents are already configured in natural language (they just pass your prompts to Vapi/Retell). Moving those same prompts to Trillet's native engine is straightforward. Budget half a day for 10 clients.

Migrating from GHL's Built-In Voice AI

GoHighLevel's Conversation AI V3 added native voice capabilities, but it functions as a CRM feature, not a dedicated voice AI platform. Agencies that started with GHL's built-in voice AI find themselves constrained by limited agent customization, no white-label voice branding, and no multi-agent orchestration as they scale past their first few clients.

What GHL Voice AI Lacks (as of June 2026)

Migration Steps

1. Keep GHL as your CRM. You do not need to leave GoHighLevel. Trillet integrates natively with GHL. The migration only replaces the voice AI component, not your CRM, workflows, or automations.

2. Recreate agents on Trillet. Use Trillet's website scraping for each client, then add any custom business rules you configured in GHL's voice AI.

3. Set up call forwarding. Forward client calls to Trillet agent numbers instead of routing through GHL's built-in voice handler.

4. Connect Trillet to GHL via native integration. Call data, contact records, and appointment bookings sync back to GHL automatically. Your CRM workflows continue running exactly as before.

5. Test the full loop. Call comes in, Trillet answers, books an appointment, syncs to GHL, triggers your existing workflow. Verify this end-to-end for each client before going live.

What to do: The GHL migration is additive, not destructive. You keep your CRM, your workflows, and your client relationships. You just upgrade the voice AI layer from a CRM feature to a dedicated platform.

The Migration Checklist

This checklist works regardless of which platform you are migrating from. Complete each step before moving to the next.

1. Sign up for Trillet Agency ($299/month). Set up your custom domain, branding, and Stripe billing before creating any client agents. Your agency's white-label identity should be ready before clients see anything.

2. Create client sub-accounts. One per client. Unlimited on the Agency plan.

3. Build agents via website scraping. Paste each client's URL. Review the auto-generated knowledge base. Add custom prompts, business rules, and specific instructions from your current platform.

4. Assign phone numbers. Trillet includes 10 phone numbers on the Agency plan. Additional numbers are $5/month each. These are agent numbers that clients forward calls to.

5. Update call forwarding on each client's phone. Carrier-tested, step-by-step guides are available for every major provider. The change takes about 30 seconds per number and does not require calling the carrier or porting anything.

6. Test 3-5 calls per agent. Cover appointment booking, FAQ, after-hours, and the specific scenarios that matter for each client's industry.

7. Run parallel for 7-14 days. Keep your old platform active during the transition. Route a subset of calls to Trillet first, then expand.

8. Switch billing. Move clients from whatever billing you used on the old platform to Trillet's native Stripe integration. Set your per-minute markup.

9. Cancel old platform. Once all clients are confirmed live on Trillet, decommission the old system.

What You Keep and What You Lose

Call forwarding means your clients' business phone numbers never change. Their customers call the same number they always have. The forwarding destination simply updates from the old platform's number to Trillet's agent number. No porting, no downtime, no changes visible to the end customer.

What Transfers

• Client phone numbers. No changes. Call forwarding updates in 30 seconds.

• Agent prompts and business rules. Copy them manually from the old platform to Trillet.

• CRM data. If you use GHL, HubSpot, or another CRM, that data stays in the CRM. Trillet connects to it via native integrations.

• Client relationships. Your clients see your brand on both platforms. The white-label transition is invisible to them if you set up branding before switching.

What Does Not Transfer

• Call history and recordings. Historical call data stays on the old platform. Export what you need before canceling. Trillet starts fresh with new call logs.

• Analytics and reporting data. Download historical reports from the old platform. Trillet's analytics begin from the migration date.

• Flow-builder configurations. Synthflow's visual flows do not map one-to-one to Trillet's dynamic conversation architecture. You recreate the agent's behavior, not the exact flow structure.

• Custom integrations built on Vapi/Retell APIs. If you wrote code against Vapi or Retell's APIs, those integrations need to be rebuilt using Trillet's API or native integrations.

How to handle this: Export all call recordings, transcripts, and analytics from your current platform before canceling. Most platforms retain data for 30-90 days after cancellation, but do not rely on that. Download everything during the parallel period.

Running Both Platforms in Parallel

Run your old platform and Trillet simultaneously for 7-14 days. This is not optional. It is the difference between a smooth migration and a crisis.

How to Structure the Parallel Period

Days 1-3: Route 2-3 low-risk clients to Trillet. These should be clients with lower call volumes or clients who are less sensitive to minor issues. Monitor call quality, response accuracy, and booking success rates.

Days 4-7: If the first batch performs well, migrate the next 5-10 clients. Review call transcripts daily. Adjust prompts for any agents that are not performing to standard.

Days 8-14: Migrate remaining clients. By this point, you have a repeatable process and have resolved any issues that surfaced with the first batches.

What to watch for: The first 48 hours after switching each client are when most issues surface. Common problems include missing knowledge base entries (the client offers a service not on their website), incorrect business hours, and calendar integration permissions. These are all fixable within minutes but require attention during the first week.

Cost of Parallel Operation

You will pay for both platforms during the overlap period. On Trillet, the Agency plan is $299/month plus usage. On your old platform, you are paying whatever you currently pay. Budget for 2-4 weeks of double billing. For most agencies, this is $300-$1,500 depending on the old platform's pricing. Consider it an insurance premium against client disruption.

The Honest Caveat

Migration has a learning curve. Trillet's dynamic conversation architecture handles calls differently than Synthflow's flow builder or Vapi/Retell's code-based agents. The first week requires extra attention: reviewing call transcripts, tweaking prompts, and adjusting agent behavior for edge cases you did not anticipate.

Agencies that have migrated report the adjustment period lasts 5-7 days per batch of clients. After that, Trillet's no-code builder makes ongoing changes faster than the platforms they left. The 5-minute agent creation and 30-second call forwarding are real. The caveat is that getting agents to production quality takes the same iterative refinement it takes on any platform. There is no magic shortcut for tuning prompts and testing real conversations.

The payoff is a single platform with predictable pricing ($299/month flat plus $0.12/minute), native compliance, and direct engineering support. No more wrapper dependency chains that stack five failure points between you and your clients. No more five-invoice billing surprises. No more waiting for a developer to make a change to an agent.

Trillet's Agency plan ($299/month, $0.12/minute, unlimited sub-accounts) includes HIPAA, SOC 2, GDPR, and TCPA compliance, custom domain, branded dashboards, and dedicated Slack support. Start at trillet.ai/whitelabel.

Frequently Asked Questions

How long does it take to migrate 20 clients from Vapi or Retell to Trillet?

Most agencies complete a 20-client migration in 2-3 days of active work, spread across a 7-14 day parallel period. Agent recreation takes roughly 5 minutes per client using website scraping. The bulk of the time goes to testing, prompt refinement, and verifying call forwarding.

Do my clients need to change their phone numbers when switching platforms?

No. Trillet uses call forwarding, not number porting. Your clients keep their existing business numbers. You update the forwarding destination from the old platform's number to Trillet's agent number. The change takes about 30 seconds and is invisible to the client's customers.

Can I keep using GoHighLevel as my CRM after switching to Trillet?

Yes. Trillet integrates natively with GoHighLevel. You are replacing the voice AI layer, not the CRM. Call data, appointments, and contact records sync to GHL automatically through Trillet's native integration. Your existing GHL workflows continue running.

What happens to my call history from the old platform?

Call history, recordings, and analytics do not transfer between platforms. Export all data from your old platform before canceling. Trillet starts fresh with new call logs from the migration date. Most platforms retain data for 30-90 days after cancellation, but download everything during the parallel period to be safe.

Is Trillet actually cheaper than Synthflow for agencies?

Trillet's Agency plan is $299/month with $0.12/minute usage and includes unlimited sub-accounts, custom domain, native CRM integrations, and HIPAA/SOC 2/GDPR/TCPA compliance. Synthflow's legacy agency plan was $1,250-$1,400/month. New Synthflow users pay per-minute with no fixed agency plan and typically need a separate CRM ($100-$300/month extra). At 10+ clients, Trillet's total cost of ownership is consistently lower.

Related Resources

• Vapi Alternative for Agencies: 5 White-Label Platforms That Actually Support Resellers

• Synthflow Alternative for Agencies: Aurora Is a Better UI, Not a Better Architecture

• Voice AI Platform Uptime: How Stacked Dependencies Stack Risks (The Math)

• AI Voice Agent Client Onboarding Checklist (First 7 Days)

• Voice AI for GHL Agencies: Why Platform Lock-In Is Your Biggest Risk in 2026