Your numbers.
Your carrier. Your call.
Run AI voice agents on the Twilio or Telnyx account you already have. No porting, no reseller markup on your minutes, and no hostage situation if you leave. Your carrier bills you at your rates; Nixflex charges a flat $0.08 a minute for the engine.
- Your Twilio account
- Your numbers
- Your carrier rates
- The voice engine
- The agent and its tools
- $0.08 a minute, flat
Bring your own carrier means the telephony stays in your account. You connect the Twilio or Telnyx account you already have, keep your numbers and your negotiated rates, and Nixflex supplies only the voice engine on top at a flat per-minute price. Nobody resells you your own minutes, and leaving does not cost you your phone number.
HOW IT WORKS
How do you connect a carrier you already use?
Keep the account you already have
You do not move numbers, open a reseller account or wait on a port. If your numbers already live in Twilio or Telnyx, they stay exactly where they are.
Connect it with your credentials
Add your carrier credentials and import the number. Nixflex works out which carrier you are on from what you send, so there is no separate setup path to choose.
Point the number at the engine
On Twilio that is the webhook on the number. On Telnyx you assign it to a TeXML application you own. Either way the routing decision stays in your account, not ours.
THE DIFFERENCE IT MAKES
Owning the line versus renting it
| Bring your own carrier | Platform sells you the number | |
|---|---|---|
The number | Lives in your account | Lives in theirs |
Call rates | Whatever you negotiated | Whatever they decide to charge |
Leaving | Repoint the number and go | Port out, or lose the number |
Your customers | Each can connect their own account | All sit inside your vendor account |
The bill | Carrier and engine, priced separately | One bundled rate, margin hidden inside |
Coverage, per-country rates and porting are carrier questions, so compare Twilio and Telnyx on those directly. Nixflex supports both equally and does not take a cut either way.
WHAT THIS BUYS YOU
Why does the boundary matter?
Leaving costs you nothing but a webhook change
The number your customers have known for years sits in your account, not ours. Switching platforms is repointing a webhook rather than a port request and a month of anxiety. A vendor that cannot hold your phone number hostage has to keep earning the business.
Two clean numbers instead of one fuzzy one
Your carrier bills telephony and Nixflex bills a flat rate for the engine. Because neither is buried inside the other, you can work out what a call actually costs you and price your own product on top with confidence.
No porting wait
Numbers you already own go live the same day.
Per-customer accounts
Each tenant can bring their own carrier credentials.
One behaviour, either carrier
Calls are normalised internally, so features never differ.
Live in about five minutes
Credentials, import, point the number, done.
THE HONEST TRADE
You do have to bring a carrier.
This model asks something of you: an account with Twilio or Telnyx before you can put an agent on a line. If you want a platform to hand you a number and one combined bill, that is a fair preference and other products do it. What you give up in exchange is knowing what your minutes cost and being able to walk away with your numbers intact. We think that trade is worth naming rather than hiding.
QUESTIONS
Carrier questions, answered
What does bring your own carrier mean?+
It means the telephony stays in your own account. You keep your Twilio or Telnyx relationship, your phone numbers and the rates you negotiated, and Nixflex supplies only the voice engine on top. The alternative, where a platform sells you numbers, leaves your telephony inside somebody else account.
Do I have to port my numbers?+
No. Numbers that already live in your Twilio or Telnyx account are used where they are. There is no port request, no letter of authorisation and no waiting period before you can put an agent on a line.
Who do I pay for the calls?+
Two separate bills, and that is the point. Your carrier bills you for telephony at your own rates, and Nixflex charges a flat $0.08 per minute of voice for the engine. Nobody is marking up your minutes in the middle, so you can see exactly what each part costs.
What is different between Twilio and Telnyx here?+
One setup step. A Twilio number carries its webhook on the number itself, while Telnyx routes calls through a TeXML application that you create in your own account and assign numbers to. That is why importing a Telnyx number asks for its connection id.
What happens if I stop using Nixflex?+
You keep everything that matters. The numbers are in your account, the carrier relationship is yours, and you change where the calls point. There is no hostage situation where leaving means losing the phone number your customers already know.
Can each of my customers use their own carrier account?+
Yes, and for a multi-tenant product that is usually the right shape. Each customer connects their own carrier account and keeps control of their own numbers and billing, while you keep one agent template running behind all of them.
Does the engine behave differently on each carrier?+
No. Calls from either carrier are normalised into one shape internally, so the agent, the tools, the transfers and the call data are identical whichever carrier a number sits on. You are not choosing a feature set when you choose a carrier.
Which carrier should I choose?+
That depends on your coverage, your rates and who you already have a relationship with, and it is genuinely a carrier question rather than one we should answer for you. Both are supported equally, so pick on price and coverage in the countries you call.
Put an agent on a number you already own.
Connect your carrier, import the number, and take the first call today.
Last updated August 2026