Cut Telephony Costs 50%: BYO Carrier with Voice AI

Published: January 19, 2026 Updated: January 19, 2026 Reading time: 12 minutes

Your voice AI platform is overcharging you for phone calls.

Every time your AI assistant picks up a call or dials out, you are paying a markup on telephony. The platform routes your traffic through their carrier account, adds 15-40% on top of wholesale rates, and bundles it into your invoice. You never see the underlying cost. You just see a per-minute rate that seems reasonable until you do the math at scale.

Here is the truth: telephony is a commodity. Carrier rates have been declining for years. Competition among SIP providers has driven wholesale calling costs to historic lows. Yet most voice AI platforms still charge 2009 prices because they control the carrier relationship.

If you are managing telecom budgets for a contact center, BPO, or enterprise deploying voice AI at scale, this markup represents real money. Tens of thousands per month. Hundreds of thousands per year. Money that should stay on your balance sheet.

There is an alternative. Bring Your Own Carrier.

The Hidden Telephony Markup in Voice AI

Let me show you how voice AI platforms actually bill for telephony.

How the Markup Works

Most voice AI platforms operate on a managed telephony model. When you sign up, they provision phone numbers through their master accounts with carriers like Twilio, Telnyx, or Vonage. Your call traffic flows through their infrastructure. They pay wholesale rates. You pay retail.

The typical cost structure looks like this:

That third row is the real story. Platforms with massive call volumes negotiate enterprise rates with carriers---sometimes as low as $0.003 per minute for domestic calling. But they still bill you at standard rates. The spread is pure margin.

What You Are Actually Paying

Let me break down a typical voice AI bill for an organization running 100,000 minutes of calling per month.

Visible costs:

• Platform fee: $3,000 ($0.03/minute)
• Telephony: $850 ($0.0085/minute)
• LLM/TTS/STT: $4,500

Total invoice: $8,350

That $850 telephony line item looks reasonable. It is 10% of your total spend. But here is what most IT leaders do not realize: if you were paying the same rates as the platform, that $850 would be $300-500.

At 100,000 minutes monthly, the telephony markup costs you $350-550 every month. That is $4,200-6,600 annually---just on the carrier spread.

Scale that to 500,000 minutes per month, and you are looking at $21,000-33,000 in annual telephony markup alone.

Why Platforms Lock You Into Their Carriers

Voice AI platforms have strong incentives to control your telephony:

Revenue diversification. LLM, TTS, and STT providers set pricing. Platforms have little room to mark up AI services without looking uncompetitive. Telephony is different---rate cards are opaque, and customers rarely comparison shop carrier costs.

Operational simplicity. Managing carrier relationships, number porting, and compliance is complex. Bundling telephony simplifies the platform's support burden.

Vendor lock-in. Your phone numbers live in their carrier account. Migrating away means porting numbers, which creates friction and switching costs.

The result: telephony becomes a hidden profit center for the platform and a hidden cost center for you.

The Alternative: Bring Your Own Carrier

BYO Carrier flips the model. Instead of using the platform's telephony infrastructure, you connect your existing carrier accounts directly to the voice AI platform.

How BYO Carrier Works

The technical architecture is straightforward:

1. You maintain carrier accounts with Twilio, Telnyx, Vonage, or any SIP-compatible provider
2. You configure your phone numbers to route to the voice AI platform's webhooks
3. Call traffic flows through your carrier account, not the platform's
4. You pay your carrier directly at your negotiated rates
5. The platform charges only for AI orchestration---no telephony markup

On Burki, BYO Carrier is supported through three methods:

Direct carrier credentials: Add your Twilio, Telnyx, or Vonage API credentials to your organization settings. Burki uses your account for all telephony operations.

BYO SIP Trunk: Connect any SIP provider directly. Configure your SIP gateway endpoints, authentication credentials (or IP-based auth), and inbound/outbound routing. Burki handles the WebSocket-to-SIP bridge.

Hybrid configuration: Use BYO for specific assistants or phone numbers while keeping others on managed telephony.

What BYO Carrier Saves You

Let me model the savings at different volumes.

Assumptions:

• Managed telephony rate: $0.0085/minute
• Your negotiated carrier rate: $0.0045/minute (typical enterprise SIP rate)
• Platform fee: $0.03/minute (unchanged)

At 1 million minutes per month, BYO Carrier saves $48,000 annually. That is a 47% reduction in telephony spend.

But those numbers assume you are paying $0.0045/minute. Many enterprises have even better rates.

Enterprise SIP Trunk Economics

According to industry research, SIP trunk pricing has become increasingly competitive. Enterprise customers with committed volume agreements routinely see rates below $0.004/minute for domestic US calling. Some high-volume operations negotiate rates as low as $0.002-0.003/minute.

Let me recalculate with aggressive enterprise pricing.

Scenario: $0.003/minute negotiated rate vs. $0.0085/minute managed rate

At 1 million minutes monthly with aggressive SIP rates, BYO Carrier saves $66,000 annually---a 65% reduction in telephony costs.

When BYO Carrier Makes Sense

BYO Carrier is not for everyone. Here is a framework for determining if it fits your operation.

BYO Carrier Is Right If:

You already have carrier relationships. If your organization has existing contracts with Twilio, Telnyx, Vonage, or a SIP provider for contact center or UCaaS operations, those negotiated rates should extend to your voice AI deployment. Paying retail through the platform makes no sense when you have wholesale access.

Your monthly volume exceeds 50,000 minutes. Below this threshold, the absolute dollar savings from BYO may not justify the operational overhead of managing separate carrier billing. Above it, the savings compound quickly.

You have specific compliance requirements. Some regulated industries require carrier relationships to remain within organizational control. Healthcare, financial services, and government deployments often mandate direct carrier contracts for audit and compliance purposes.

You need number portability. Phone numbers provisioned through a platform's managed telephony live in their carrier account. If you ever migrate platforms, porting becomes a negotiation. With BYO, your numbers are in your account---you control portability.

Your IT operations team has capacity. BYO means managing carrier credentials, monitoring telephony separately from AI costs, and handling carrier-side issues directly. This requires operational bandwidth.

Managed Telephony Is Fine If:

You are in early deployment. When testing voice AI, operational simplicity matters more than cost optimization. Start with managed telephony, then migrate to BYO once you have validated the use case and understand your volume trajectory.

Monthly volume is under 25,000 minutes. At lower volumes, the markup is negligible in absolute terms. A $100-200 monthly markup is not worth the complexity of managing separate carrier relationships.

You have no existing carrier agreements. If you would be paying retail SIP rates anyway, the platform's managed telephony might offer comparable pricing with less operational overhead.

Single-vendor billing is required. Some procurement processes require consolidated invoicing. If your organization cannot handle multiple vendor relationships for a single project, managed telephony simplifies accounting.

Cost Comparison: The Full Picture

Voice AI costs have multiple components. Let me show you how BYO Carrier fits into the total cost equation.

Complete Voice AI Cost Breakdown (100,000 minutes/month)

Managed Mode (everything through platform):

*Includes 15% managed markup

BYO Carrier Only (telephony direct, AI managed):

Monthly savings: $400 (6.5%)

Full BYO Mode (telephony and AI providers direct):

Monthly savings vs. full managed: $960 (15.6%)

The takeaway: BYO Carrier alone saves 6-7% on total voice AI spend. Combined with BYO API keys for AI providers, savings reach 15-20%.

How to Set Up BYO Carrier on Burki

Setting up BYO Carrier takes 15-30 minutes depending on your configuration.

Option 1: BYO Twilio/Telnyx/Vonage

If you have existing accounts with these providers, setup is straightforward.

Step 1: Gather credentials

• Twilio: Account SID and Auth Token
• Telnyx: API Key
• Vonage: API Key and API Secret

Step 2: Add credentials to Burki

Navigate to Organization Settings > Provider Settings > Telephony. Select your provider and enter your credentials. Credentials are encrypted at rest using AES-256.

Step 3: Configure phone numbers

For each phone number you want to use:

• In your carrier's dashboard, configure the voice webhook URL to Burki's inbound endpoint
• In Burki, add the phone number and assign it to an assistant or graph

Step 4: Test inbound and outbound

Make a test call to verify inbound routing. Initiate an outbound call from Burki to verify your credentials work. Check your carrier dashboard to confirm usage appears in your account.

Option 2: BYO SIP Trunk

For carriers beyond Twilio/Telnyx/Vonage, or if you prefer SIP-level integration.

Step 1: Configure SIP credentials in Burki

Navigate to Organization Settings > SIP Trunk Configuration. Enter:

• SIP Gateway hostname/IP
• Authentication method (credentials or IP-based)
• Username and password (if credential auth)
• SIP domain (if applicable)
• Inbound/outbound enable flags

Step 2: Configure your SIP provider

Point your SIP trunk to Burki's SIP endpoint. Configure any required codecs (G.711 recommended for telephony quality). Set up any IP whitelisting if using IP-based auth.

Step 3: Route phone numbers

Configure DIDs in your SIP provider to route to Burki. In Burki, add the DIDs and assign to assistants.

Step 4: Test thoroughly

SIP configurations can be sensitive to codec mismatches and NAT traversal issues. Test inbound, outbound, and transfer scenarios before production deployment.

Option 3: Hybrid Configuration

You can mix BYO and managed telephony at the assistant or phone number level.

Common hybrid patterns:

• BYO for high-volume assistants, managed for low-volume
• BYO for outbound campaigns, managed for inbound support
• BYO for production, managed for development/testing

Configure this per-assistant in Burki's assistant settings.

Negotiating Better Carrier Rates

If you are committing to BYO Carrier, take time to optimize your carrier agreements.

Leverage Competition

SIP trunk pricing is highly competitive. The major providers---Twilio, Telnyx, Vonage, Bandwidth, Plivo---all compete aggressively for enterprise accounts. Get quotes from at least three providers before committing.

Commit to Volume

Carriers offer significant discounts for volume commitments. A 12-month commitment at 500,000 minutes/month typically unlocks 20-40% better rates than pay-as-you-go. Run the numbers---the commitment savings often exceed the flexibility cost.

Bundle Services

If you use the same carrier for UCaaS, contact center, or SMS, negotiate voice AI minutes into your existing agreement. Carriers prefer consolidated relationships and will discount accordingly.

Audit Annually

Carrier rates decline over time. Renegotiate annually, even if you are mid-contract. Carriers often extend better rates to retain accounts rather than lose them to competitors.

Consider Regional Carriers

For specific geographies, regional SIP providers sometimes offer better rates than global carriers. If 80% of your traffic is US domestic, a US-focused carrier might outperform a global provider.

Frequently Asked Questions

Does BYO Carrier affect call quality?

No. Call quality depends on your carrier's network and codec configuration, not on whether billing goes through the platform. The audio path is identical.

What happens if my carrier has an outage?

You would need to manage the outage directly with your carrier. In managed mode, the platform handles carrier escalations. With BYO, you own that relationship. Consider configuring a backup carrier for critical deployments.

Can I port my numbers from managed to BYO?

Yes, but it requires coordination. Numbers provisioned through Burki's managed telephony can be ported to your own carrier account. Contact support to initiate the porting process.

Do I lose any features with BYO Carrier?

No. All Burki features---call recording, transcription, transfers, DTMF, voicemail detection---work identically with BYO Carrier. The only difference is billing.

What about international calling?

BYO works for international calls using your carrier's international rates. This is often where savings are largest, as platform markups on international calling can exceed 100%.

Can I use multiple carriers?

Yes. You can configure multiple carrier credentials and route different phone numbers or assistants through different carriers. This enables geographic optimization and redundancy.

How do I track BYO telephony costs in Burki?

Burki's analytics show call duration and count regardless of billing mode. Cross-reference with your carrier invoices for complete cost tracking. We are building direct carrier cost integration for future releases.

The Telecom Budget Optimization Playbook

If you manage telecom budgets for an organization deploying voice AI, here is your action plan.

Step 1: Audit Current State

Pull your voice AI invoices for the past 3 months. Identify:

• Total telephony spend
• Per-minute effective rate
• Monthly call volume
• Inbound vs. outbound split

Step 2: Benchmark Against Wholesale

Get quotes from SIP providers for your volume level. Compare your current effective rate against:

• Retail SIP rates (typically $0.006-0.010/minute)
• Enterprise SIP rates (typically $0.003-0.005/minute)

Calculate the gap. This is your savings opportunity.

Step 3: Evaluate Existing Agreements

Check if your organization has existing carrier contracts that cover voice AI usage. Many enterprises have Twilio or Telnyx agreements for other applications that voice AI could piggyback on.

Step 4: Build the Business Case

Model BYO Carrier savings at current volume and projected growth. Include:

• Direct telephony savings
• Operational overhead costs (minimal if you have existing carrier relationships)
• Risk factors (carrier management responsibility)

Step 5: Implement Incrementally

Start BYO with a subset of phone numbers or assistants. Validate the configuration, confirm billing accuracy, then expand.

Step 6: Monitor and Optimize

Track telephony spend monthly. Renegotiate carrier rates annually. Evaluate new providers as the market evolves.

The Bottom Line

Voice AI platforms make money on telephony markups. They are counting on you not to notice.

But if you are running voice AI at scale---50,000 minutes per month or more---the markup adds up. $5,000. $25,000. $50,000 annually. Real money that could fund additional AI development, expand your deployment, or simply improve your margins.

BYO Carrier eliminates the middleman. You use your existing carrier relationships. You pay your negotiated rates. The voice AI platform handles AI orchestration. Telephony stays where it belongs---as a commodity input, not a profit center for someone else.

Burki is built for organizations that care about unit economics. Our BYO Carrier support includes:

• Direct integration with Twilio, Telnyx, and Vonage accounts
• Native SIP trunk support for any carrier
• Per-assistant carrier configuration
• No markup, no fees, no lock-in

Your carriers. Your rates. Your cost control.

Ready to reduce your telephony costs? [Start with 200 free minutes](https://burki.dev/signup) to test BYO Carrier with your existing carrier accounts.

Related reading:

• BYO Mode Explained: Bring Your Own API Keys to Voice AI
• BYO vs Managed: Which Voice AI Mode Saves More?
• Voice AI Platform Pricing Comparison 2026