What does SIP stand for?

SIP stands for session initiation protocol and is a standard which describes how phone systems can establish calls, maintain the connection between phone systems so that voice and data can be transmitted when a call is active, and terminate the connection when the call is over.

How many SIP trunks do I need?

One SIP trunk is all your business needs to run all of your communications. Once your trunk is set up, you can scale up or down concurrent call capacity by adding or removing usage channels, or choose pay-per-minute billing for unlimited concurrent inbound call capacity.

How much does SIP trunking cost?

SIP trunking is cheaper than traditional business phone systems. We offer pay-as-you-go pricing with automatic volume discounts as you scale. Find out more with an in-depth breakdown of our [pricing](https://telnyx.com/pricing/elastic-sip), or [talk to an expert](https://telnyx.com/contact-us) to get a custom quote.

What are the benefits of SIP trunking?

SIP trunking has a huge range of benefits over traditional business telephony systems, including [scalability](https://telnyx.com/resources/sip-trunking-capacity-private-network), [cost savings](https://telnyx.com/resources/new-and-improved-price-for-outbound-calls) and [configurability](https://telnyx.com/use-cases/mission-control). Find out more about what SIP trunking can do for you in our [Resource Center](https://telnyx.com/resources/sip-trunking-explained).

How can I get started with SIP trunking?

Getting set up couldn't be easier. Just [sign up](https://telnyx.com/sign-up) for an account, purchase a phone number, set up your SIP connection, assign a phone number to your SIP connection, and start calling.

How do I configure SIP trunks?

You can configure, monitor and manage your SIP trunks through the Telnyx [Mission Control Portal](https://telnyx.com/mission-control). For large-scale or automated configuration, you can also leverage the [Telnyx API](https://developers.telnyx.com) to configure your communications programmatically.

What is a SIP Connection?

SIP Connections allow users to set SIP Trunks for Inbound and Outbound calling.

What is Bring Your Own Carrier?

Bring Your Own Carrier (BYOC) solutions allow businesses to decouple their telephony provider from their UC platform and bring Telnyx as their carrier for cost savings and scalability. Follow one of our [Bring Your Own Carrier](https://telnyx.com/use-cases/bring-your-own-carrier) guides to integrate with your PBX or soft phone client.

A global enterprise-grade SIP network

Name: SIP Trunks
Brand: Telnyx
Price: 0.0035 USD
Availability: InStock

Reliable voice calling and PSTN connectivity on a backbone we own, not rent, all at reduced cost. Make the switch from Bandwidth, Twilio, Vonage, and legacy carriers.

Talk to an expert View pricing

Get started in the portal

230+countries for international SIP trunking

500M+SIP calls processed monthly

7M+Active phone numbers managed globally

WHY TELNYX

Carrier, not reseller. Most SIP trunking on the market is resold.

Platforms buy capacity from tier-1 carriers, mark it up, and pass the cost and the finger-pointing to you. Every layer between you and the network takes margin and adds a party to blame when something breaks. Telnyx owns the switch. The price, the call quality, and the single point of accountability all trace back to one fact: we are the carrier, not a layer on top of one.

“We’ve ramped from hundreds to hundreds of thousands of calls per day with customers without experiencing any issues from Telnyx. It’s been seamless.”

Benjamin Gleitzman

CTO and Co-Founder

FEATURES

Enterprise Voice

Higher answer rates start at the carrier layer. Because we own the network, your calls go out verified, not blocked, and clear on HD voice.

HD Voice
Wideband codecs including AMR-WB for clearer conversations on both the customer and agent legs.
Branded Calling
Your brand shows up on the recipient's screen, so customers know who is calling before they answer.
STIR/SHAKEN
A-level attestation issued by the carrier, so caller identity is verified end to end rather than inherited.
CNAM
Caller name presentation managed at the carrier layer for consistent, trusted display.
Spam protection
Outbound voice profiles protect your traffic against fraud and spam before it leaves the network.
Voice Integrity
Reputation monitoring and remediation to keep your numbers from being flagged as spam.

HD Voice
Wideband codecs including AMR-WB for clearer conversations on both the customer and agent legs.
Branded Calling
Your brand shows up on the recipient's screen, so customers know who is calling before they answer.
STIR/SHAKEN
A-level attestation issued by the carrier, so caller identity is verified end to end rather than inherited.
CNAM
Caller name presentation managed at the carrier layer for consistent, trusted display.
Spam protection
Outbound voice profiles protect your traffic against fraud and spam before it leaves the network.
Voice Integrity
Reputation monitoring and remediation to keep your numbers from being flagged as spam.

Security

End-to-end encryption

Built with security at the core, our infrastructure protects customer data with encrypted, monitored, auditable interactions. It meets the highest industry standards so you can confidently protect data and maintain regulatory compliance.

HOW IT WORKS

RESOURCES

Start building

Setup SIP connections in minutes.

curl -X POST \
  --header "Content-Type: application/json" \
  --header "Accept: application/json" \
  --header "Authorization: Bearer YOUR_API_KEY" \
  --data '{"connection_name": "Test Connection", "user_name": "MyUser", "password":"my123secure456password789"}' \
  https://api.telnyx.com/v2/credential_connections

SIP trunk setup
Take a look at how to get started with our SIP Trunking APIs. Configure your connections as needed and start making and receiving calls globally in minutes.
Explore docs
Telnyx ranked in G2's 2025 Best Software Awards
Recognized for our powerful APIs, private global network, and unmatched customer support.
Learn why
Porting away from Twilio
Navigate the voip.ms porting process with ease. Discover key account details and Telnyx's porting procedure.
Read article

PRICING

See our SIP trunking pricing

Telnyx customers only pay for what they use, and typically save up to 50% over other CPaaS providers. Lower list pricing and automatic volume discounts are built in as you scale.

Starting at:

$0.0032

Per minute

See pricing

PRODUCTS

All your communication needs, on infrastructure built for reliability.

Sign up and start building

Talk to an Expert Sign up

FAQ

SIP trunking, put simply, is a means of operating phone systems over the internet, instead of using a traditional phone line. Learn more about how SIP trunking can transform your business communications on our Resource Center.

Resources, Docs, Support

Sip Trunks hub

SIP Trunking | Telnyx
Instantly scale voice connections with Elastic SIP Trunking. Experience low-latency, jitter-free calling with no packet loss on our private Tier-1 network.
Read more
Get Started with Telnyx SIP Trunking | Telnyx
Telnyx's SIP Trunking Getting Started guide provides all the information you need to get started with SIP trunking. In this guide, you'll learn how to create a Telnyx account, configure your devices, and make calls with SIP trunking.
Read more
SIP Quickstart | Telnyx
Telnyx's Developer Portal is the best place to start if you're looking to create a voice application. In this quickstart, you'll learn how to create a new portal and configure your SIP trunking settings.
Read more
SIP Trunking Configuration Guides | Telnyx
Telnyx's SIP trunking guide will help you configure your sip devices for use with our service.
Read more
Account Setup | Telnyx
Outlines the process of setting up a Telnyx account.
Read more
List connections API | Telnyx
Returns a list of your connections irrespective of type.
Read more
Create a credential connection API | Telnyx
Creates a credential connection.
Read more
List available phone numbers API | Telnyx
List available phone numbers
Read more
Retrieve a phone number with voice settings API | Telnyx
Retrieve a phone number with voice settings
Read more
Get all outbound voice profiles API | Telnyx
Get all outbound voice profiles belonging to the user that match the given filters.
Read more
Telnyx Blog | CPaas & UCaaS Resources
Find data-driven research, comprehensive guides and all things SIP trunking, voice and SMS APIs, wireless and more.
Read more
What is SIP Trunking? Session Initiation Protocol Explained
This SIP Trunking 101 guide will tell you everything there is to know about SIP Trunking, and how to start improving your communications today.
Read more
SIP trunking architecture: What is it, and how does it work?
Learn how SIP trunking architecture works so your business can experience advanced communications and connectivity.
Read more
Setting up a SIP trunk — A step-by-step guide - Telnyx
Learn how to set up a SIP Trunk in a matter of minutes with Telnyx today.
Read more
Everything You Need To Know About Call Origination
Learn about call origination with Telnyx: what it is, how it works, and what to look for in a provider.
Read more
SIP Trunk vs PRI | The Clear Winner for Your Business
SIP Trunk vs PRI: Get a complete breakdown of the difference between primary rate interface and session initiation protocol and which is best for business.
Read more
SIP vs VoIP — Breaking down the key differences - Telnyx
SIP vs VoIP. While VoIP refers to any internet-based phone service, SIP Trunking refers to a communication protocol that is used for most VoIP.
Read more
Telnyx vs. Twilio for Elastic SIP Trunking Comparison
Telnyx and Twilio are both popular providers for Elastic SIP Trunking services, but their products differ in some fundamental ways.
Read more
Understanding Inbound SIP Trunking for Your Business [2021]
Understanding inbound and outbound SIP trunking for your business. Pay for the features you need while scaling your call capabilities.
Read more
SIP meaning: common terms and definitions
Ever wondered about the origin or meaning of particular SIP terms, acronyms or buzzwords? We shed some light in this blog post.
Read more
The Better Twilio Alternative - Telnyx
Switch to Telnyx for a better Twilio alternative. Benefit from our competitive pricing, private global network, and award-winning support.
Read more
The best Bandwidth alternative - Telnyx
Looking for a Bandwidth alternative? Compare Telnyx vs. Bandwidth on reliability, pricing, and support. See why Telnyx is the top choice.
Read more
How to Configure a SIP Trunk | Telnyx Help Center
Step-by-step guide on setting up a SIP Trunk with Telnyx using a compatible soft phone or system.
Read more
Telnyx SIP Trunking Configurations | Telnyx Help Center
Use Telnyx as your voice carrier with the compatible soft phone or pbx of your choice.
Read more
SIP protocols that Telnyx uses | Telnyx Help Center
Wondering what SIP transport protocols are used at Telnyx? Find out more here.
Read more
SIP Connection | Telnyx Help Center
Guide to SIP connections: AnchorSite® settings, IP authentication, and SIP URI calls.
Read more
SIP Connection: Number Formats | Telnyx Help Center
Here we will talk about SIP connections and ANI/DNIS number format control!
Read more
Inbound/Outbound Voice | Telnyx Help Center
Inbound/Outbound Voice configuration guideline materials. Start building on Telnyx today.
Read more
Migrate To Telnyx From An Existing SIP-Enabled Platform
Bring Your Own Carrier To Telnyx & save money while improving call quality, reporting, & scalability. Works with Twilio, Plivo, Vodia, Elastix, 3CX & More.
Read more
VoIP for Small Business | Top Rated VoIP Solution
Find out what makes Telnyx the best VoIP provider, and find the perfect plan for your small business.
Read more

A global enterprise-grade SIP network

230+countries for international SIP trunking

500M+SIP calls processed monthly

7M+Active phone numbers managed globally

Enterprise Voice

End-to-end encryption

Set up a portal account

Purchase a phone number

Create a SIP connection

Start talking

SIP trunk setup

Telnyx ranked in G2's 2025 Best Software Awards

Porting away from Twilio

See our SIP trunking pricing

All your communication needs, on infrastructure built for reliability.

Sign up and start building

FAQ

What is SIP trunking?

What does SIP stand for?

How many SIP trunks do I need?

How much does SIP trunking cost?

What are the benefits of SIP trunking?

How can I get started with SIP trunking?

How do I configure SIP trunks?

What is a SIP Connection?

What is Bring Your Own Carrier?

SIP Trunking | Telnyx

Get Started with Telnyx SIP Trunking | Telnyx

SIP Quickstart | Telnyx

SIP Trunking Configuration Guides | Telnyx

Account Setup | Telnyx

List connections API | Telnyx

Create a credential connection API | Telnyx

List available phone numbers API | Telnyx

Retrieve a phone number with voice settings API | Telnyx

Get all outbound voice profiles API | Telnyx

Telnyx Blog | CPaas & UCaaS Resources

What is SIP Trunking? Session Initiation Protocol Explained

SIP trunking architecture: What is it, and how does it work?

Setting up a SIP trunk — A step-by-step guide - Telnyx

Everything You Need To Know About Call Origination

SIP Trunk vs PRI | The Clear Winner for Your Business

SIP vs VoIP — Breaking down the key differences - Telnyx

Telnyx vs. Twilio for Elastic SIP Trunking Comparison

Understanding Inbound SIP Trunking for Your Business [2021]

SIP meaning: common terms and definitions

The Better Twilio Alternative - Telnyx

The best Bandwidth alternative - Telnyx

How to Configure a SIP Trunk | Telnyx Help Center

Telnyx SIP Trunking Configurations | Telnyx Help Center

SIP protocols that Telnyx uses | Telnyx Help Center

SIP Connection | Telnyx Help Center

SIP Connection: Number Formats | Telnyx Help Center

Inbound/Outbound Voice | Telnyx Help Center

Migrate To Telnyx From An Existing SIP-Enabled Platform

VoIP for Small Business | Top Rated VoIP Solution