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Global SIP Trunking Provider

Global SIP Trunking Provider

Harness the power of cloud-ready elastic SIP trunking with integrated E911 support and global scale.

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Take your enterprise to the cloud with elastic SIP trunking services that integrate everywhere

Easily navigate your digital transformation with Bandwidth’s worldwide coverage, flexible usage-based pricing, and intuitive software tools.

Cloud phone call

Leverage a unified network with global scale

Bring high-quality calling at scale with Bandwidth’s cloud-native carrier network. Paired with elastic, usage-based pricing, you can consolidate legacy SIP vendors, remove your on-prem equipment, and eliminate costly, inflexible PRI lines and direct PSTN access worldwide.

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Order and migrate numbers without disruption

Our Dashboard & API suite make it easy to manage ports, order phone numbers, and get the real-time insights into telecom cost centers you need. You can better enable workstation management by provisioning numbers instantly, then port numbers instantly with real-time migration and roll-back.


Integrate our SIP trunking services with Microsoft Teams, Genesys, RingCentral and more

Seamlessly integrate Bandwidth’s SIP trunking services with leading UCaaS and Contact Center platforms like Microsoft Teams, RingCentral, Genesys and more, giving you the flexibility to unbundle telephony and control both quality and cost on PSTN access.

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Maintain compliance with seamless 911 integrations

Leverage Bandwidth’s advanced E911 capabilities as you update your systems and infrastructure to ensure your enterprise maintains compliance with 911 regulations.

Cloud-ready, Enterprise SIP trunking software

Bring an enterprise-grade SIP trunking provider to your organization with the reliable, software-driven voice calling you need:

  • Activate your workforce with no-disruption number porting and provisioning
  • Lower your SIP costs by paying only for what you use vs. a monthly seat fee
  • Scale up or down according to your needs with burstable functionality
  • Maintain compliance with new and evolving E911 regulations
  • Leverage real-time disaster recovery and IP failover control with 100% US-based support
  • Access global coverage across 90%+ of worldwide GDP
  • Deploy full PSTN replacement available in over 30 countries

Bring the power of Bandwidth’s SIP services to your enterprise

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Centralize your SIP Trunking Services

Work with a migration partner, not just a service provider. Together, we’ll centralize your SIP trunking services on our software-centric carrier network to give you greater control and visibility — all while simplifying your UCaaS and CCaaS migrations.

Purple and blue circles


Bring the scalability, security and cost efficiencies your enterprise needs to continue growing when you make the move from PRI to SIP with Bandwidth.

Bring your own carrier

Bring your own carrier (BYOC)

Lower your costs and improve control when you plug your SIP provider into your contact center, conferencing or unified communications platforms.

A provider trusted by industry leaders and innovators

Bandwidth enables enterprises around the world to send reliable , enterprise-grade voice and messaging in the countries they need. Analysts and industry leaders agree—Bandwidth’s global network is a game changer.

Voice API support employee

A better approach to support

Many SIP trunking providers claim to be support-centric, but we prove it by just being easier to work with. We hold ourselves accountable through SLA achievement and a near perfect CSAT benchmark, and ensure you’re successful by providing dedicated support teams backed by industry vets with the expertise and experience to tackle the most demanding situations. You’ll wonder why everyone doesn’t have the same approach.


With Bandwidth, you’ll receive:

  • A named implementation specialist to guide you through your personalized migration plan
  • A dedicated team of porting experts to ensure a happy migration experience
  • Dedicated support personnel to manage needs as you scale over time
  • 24/7 monitoring by our in-house Network Operations Center (NOC)
  • 98% CSAT achieved by our 24/7 Technical Assistance Center (TAC)
  • Industry experts that help navigate changing telecom requirements
  • Clear, always available escalation paths
  • Customer-driven prioritization of support tickets

Ready to get started with our SIP trunk services?

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Related resources

Global SIP trunking service: frequently asked questions

What is SIP?

SIP stands for Session Initiation Protocol and is a protocol (i.e. language) that communications applications use to talk to one another over an IP network.

SIP is used to create, manage, and terminate calls (or sessions) in an IP-based network, SIP is the instruction set that tells an application how to process a phone call.

What is a SIP Trunking Service?

SIP Trunking is a way to make voice calls over the internet. This communication method allows for Voice Over Internet Protocol (VoIP) calls to be made, for messages (SMS/MMS) to be passed, 911 emergency calls to be made, and other SIP-based real-time communications.

What are the benefits of SIP Trunks versus PRI?

The primary benefit of SIP trunks over PRIs is cost savings as this method is far more scalable, and generally comes with less fixed overhead costs.

SIP makes converged networks possible because it is an application, not a service. In the same way that copper lines transmit signals rather than create them, SIP allows any endpoint to communicate with another, as long as the two endpoints agree to use SIP. That means that a single-location company can converge its networks, roles, and equipment into one system that meets all of its communication needs. Convergence offers concrete benefits, in that:

  • Routers and switches are used more efficiently
  • Combined roles are enabled, so endpoints can both send and receive voice, data, and video
  • Networks can be mixed to integrate voice and applications
  • Costs are reduced because SIP is a virtual infrastructure
  • SIP Trunking removes the TDM Constraint and provides flexibility to manage at scale
  • Fewer or even just one SIP provider must be engaged

How does SIP trunking benefit your business?

Speed, agility, and leanness are guiding principles for companies that need to stay competitive today. And in order to support those principles,
businesses need technology that supports them as well. Compare SIP to traditional phone services and the advantages are clear.

SIP delivers significant savings. Traditional analog circuits are costly because they have to be designed, configured, maintained, and upgraded. SIP trunking provides the same call quality as traditional line, but since it runs over the Internet, it doesn’t require the same level of design and configuration. Plus, the maintenance and upgrades to the network would be necessary whether SIP trunking was being run through them or not.

The infrastructure costs for SIP trunking are also lower because SIP eliminates the need for primary rate interfaces (PRIs), which require enterprises to buy lines in bundles of 23. PRI customers who need 10 lines have to buy a bundle of 23, leaving 13 unused. SIP, however, can be purchased in whatever number of units a business requires.

Long distance, local inbound, and termination services can be included, providing another opportunity to save costs. Plus, SIP trunking delivers cost savings as great as 60% over traditional methods.

When should a business use SIP Trunking instead of a hosted solution?

A business should look to a SIP trunking provider when they decide that their needs are being met with a premise based PBX, but want the benefit of virtual circuits and more flexible pricing options.This system is often referred to as an IP-PBX (Internet Protocol private branch exchange). Coupled with SIP trunks, an IP-PBX serves up similar features to hosted solutions. SIP trunks typically save a business customer money over a hosted solution in that a SIP trunk can serve the needs of three to four employees, while a hosted seat is needed for each employee.

What equipment do I need to be able to use SIP Trunking?

Today many companies use SIP trunking to power the calling within their UCaaS and CCaaS platforms, but generally SIP Trunks can work with any SIP-ready hosted PBX system. SIP Trunks can also be made to work with a traditional analog or key phone system with an IAD (Integrated Access Device).

Is SIP here to stay?

With all the advantages that SIP trunking offers, why do any companies still use traditional services? It’s simple. Traditional telecom has been in existence for over 100 years. Over its lifetime, copper has been widely adopted, of course, and it’s the telephone technology that most of us grew up using. The short answer is: it was the best option that businesses have had until recent years. SIP trunking is only about 10 years old. That means it was purpose-built to work in today’s business environment. Since the advent of SIP trunking as a business tool, nearly 70% of decision-makers have adopted SIP, and of those adopters, 96% report satisfaction with call quality. A protocol can only achieve widespread adoption when it’s based on consistent standards. The guidelines for how a SIP trunk should work and interoperate with a phone system are defined and guided by the SIP Forum, an organization of telecom experts who work toward the continual improvement of SIP standards.

Does network ownership matter for SIP?

Network ownership does matter, particularly for larger organizations with higher call volumes. Large enterprises tend to see more call volume as they have more employees and customers that rely on underlying SIP services to do business. As the sheer volume of communications that are critical for doing business increase, so does the risk and potential cost assumed by the enterprise in the event of an outage. Therefore, it’s critical to pick a SIP Trunking provider that is an actual carrier with ownership of the underlying network. This will allow the enterprise to maintain greater control and visibility into their services, as well as go directly to the source for resolution if there are ever issues or disruptions in service.

While most SIP providers are resellers that rely on several carriers, Bandwidth gives you direct-to-carrier access, meaning we cut out the middleman, giving you better support with deeper insights and faster results.

Industry leaders such as Google & Microsoft rely on Bandwidth because of our record of stability, innovation, reliability, and growth. Bandwidth is able to meet these challenges because we’re a Tier 1 carrier—we own and operate a nationwide network, with billions of minutes traversing it every month.

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