In 2025, Session Initiation Protocol (SIP) trunking will be the top choice for businesses. Why? It’s a modern, flexible and affordable communication system. Old phone systems use stiff copper lines. In contrast, SIP trunking uses the internet. This virtual approach gets rid of costly hardware. The result is a system that’s more scalable and reliable.
To help you find the best provider, we analyzed over 25 SIP companies. We looked at customer reviews from trusted sites like Gartner and G2. This guide compares the top 10 providers. We’ll cover their pricing, special features, and which businesses they’re best for.
Comparison Table of Top SIP Trunking Providers
| Provider | Starting Price | Key Features | Best For |
| Plivo | Custom pricing | Elastic usage-based pricing, global network, 7 data centers | Best for Scaling Teams |
| Twilio | Pay-as-you-go | Global scale, flexible pricing, Voice Insights analytics | Best for Developers & Customization |
| Bandwidth | Custom pricing | Affordable solution, redundant routing, voice analytics | Best for Designing Call Flows |
| Ooma | $19.95/month | Flexible, easy-to-use, desk phone compatibility | Best Value for Small Businesses |
| Nextiva | $14.95/month | Flexible payment plans, advanced reporting, team messaging | Best for Flexible Payments |
| SIP.US | $24.95/channel | Unlimited calling in the US, fraud protection, simple pricing | Best for Flat-Rate Pricing |
| Vonage | Contact for quote | Comprehensive UCaaS platform, video, chat, file sharing | Best for Unified Communications |
| 8×8 | $25.00/channel | 24/7 live support, global coverage, custom call forwarding | Best for Customer Support |
| Verizon | Per-minute pricing | Reliable network, scalability, enterprise-grade features | Best for Large Enterprises |
| Global Call Forwarding | Varies by country | Global SIP trunks, local caller ID, no commitment | Best for International Presence |
Top 10 SIP Trunking Providers
1. Plivo
Overview: Plivo is a smart choice for businesses aiming to boost their communications quickly and effortlessly. Its pay-per-minute pricing and volume discounts make it a cost-effective solution for managing fluctuating call volumes.
Key Features: Global coverage in over 220 countries, 7 data centers for optimal performance and robust APIs for custom integrations.
Integrations: Plivo offers powerful APIs that allow for seamless integration into various applications and workflows.
Pros & Cons: Pros: Great for scaling teams, extensive global network, transparent pay-per-minute pricing.
Cons: Features can be overwhelming, and live phone support can be difficult to get.
Pricing Breakdown: Usage-based, starting at 0.65 cents per minute for outbound calls and 0.25 cents for inbound.
Best For: Companies with scaling teams or a high volume of international calls.
Unique Selling Point (USP): Its seven global data centers ensure exceptional audio quality and connectivity worldwide.
2. Twilio
Overview: Twilio is a top choice for businesses thanks to its developer-friendly design and flexible pay-as-you-go pricing. It lets you scale instantly on a global level with virtually unlimited capacity, making it an ideal solution for companies that want to create customized and reliable communication tools.
Key Features: Voice Insights for real-time call quality monitoring, on-demand features via its API, and enterprise-grade features like quality monitoring and alert triggers.
Integrations: Designed for developers, Twilio integrates with almost any platform through its powerful and well-documented APIs.
Pros & Cons: Pros: Highly scalable, flexible pricing, superior voice analytics.
Cons: Requires technical expertise for setup and management, can be more complex than other providers.
Pricing Breakdown: Pay-as-you-go model with pricing per-minute and per-number.
Best For: Growing businesses and developers who require a highly customizable and scalable solution.
Unique Selling Point (USP): Its Voice Insights feature provides unparalleled data on call performance helping businesses troubleshoot and improve call quality.
3. Bandwidth
Overview: Bandwidth is an affordable SIP trunking solution that provides a robust network for improving operations and expanding reach. It’s a great choice for companies that need an affordable solution with all the features of a heavy-hitting service.
Key Features: Redundant routing, voice analytics, and a wide selection of local and toll-free numbers.
Integrations: Bandwidth is compatible with most modern PBX systems and offers APIs for custom development.
Pros & Cons: Pros: Cost-effective, scalable, excellent for designing call flows.
Cons: Custom pricing requires a quote, which can delay the decision-making process.
Pricing Breakdown: Custom pricing based on a variety of factors.
Best For: Companies looking for an affordable yet powerful solution with advanced features.
Unique Selling Point (USP): Bandwidth’s ability to help companies design their call flows provides a high degree of control over their communication infrastructure.
4. Ooma
Overview: Ooma is an easy-to-use SIP trunking provider that offers great desk phone compatibility. It’s a best choice for businesses of all sizes offering flexible and affordable plans.
Key Features: High uptime, clear call quality and both metered and unlimited payment plans.
Integrations: Ooma works with a wide range of desk phone models, ensuring a smooth transition for businesses that prefer physical hardware.
Pros & Cons
Pros: Easy to use, great desk phone compatibility and affordable.
Cons: It lacks some of the advanced features of enterprise-focused providers.
Pricing Breakdown: Starts at $19.95 per month/per trunk.
Best For: Small businesses and offices that want a simple and reliable solution without a steep learning curve.
Unique Selling Point (USP): Its focus on desk phone compatibility makes it a top choice for businesses that value traditional hardware.
5. Nextiva
Overview: Nextiva makes it easy for businesses to choose a SIP trunking plan that fits their specific calling habits. Its flexible metered and unmetered options provide a great deal of control over budgeting.
Key Features: Advanced reporting, team messaging, and video conferencing capabilities.
Integrations: Nextiva offers seamless integration with various communication platforms making it a unified communication powerhouse.
Pros & Cons
Pros: Flexible payment plans, excellent for businesses with predictable call volumes and robust feature set.
Cons: Pricing can become complex depending on the plan.
Pricing Breakdown: Metered plans start at $14.95 per month, with per-minute rates for additional calls.
Best For: Businesses that need a solution with flexible payment options and a comprehensive suite of unified communication tools.
Unique Selling Point (USP): Nextiva’s clear and straightforward plan comparisons on their website help businesses make an informed decision easily.
6. SIP.US
Overview: SIP.US provides a reliable and transparent SIP trunking service with a focus on unlimited calling plans in the US. It’s an excellent choice for businesses that want a predictable monthly bill.
Key Features: Unlimited U.S. calling, international call fraud protection and an intuitive control panel.
Integrations: Compatible with most modern IP PBX systems, SIP.US offers a user-friendly platform for management.
Pros & Cons
Pros: Flat-rate pricing, strong fraud protection, easy to manage.
Cons: May not be the best choice for businesses with very low call volumes or high international calling needs.
Pricing Breakdown: Starts at $24.95 per channel per month for unlimited U.S. calling.
Best For: Businesses with consistent and high-volume calling within the United States.
Unique Selling Point (USP): The unlimited U.S. calling per channel at a fixed monthly rate provides budget predictability.
7. Vonage
Overview: Vonage is a well-known provider that offers a powerful and comprehensive unified communication platform, with SIP trunking as a core component. It’s a great choice for businesses looking for more than just voice calls.
Key Features: Video conferencing, messaging, and file sharing are all integrated into the platform.
Integrations: As a UCaaS provider, Vonage integrates with a wide range of CRM, collaboration, and business applications.
Pros & Cons:
Pros: All-in-one UCaaS solution, strong feature set, reputable brand.
Cons: Pricing is not as transparent and requires a custom quote.
Pricing Breakdown: Contact Vonage for a custom quote.
Best For: Businesses that need a fully integrated communication solution beyond just voice calls.
Unique Selling Point (USP): Its comprehensive UCaaS platform provides a one-stop shop for all business communication needs.
8. 8×8
Overview: 8×8 is a solid choice for businesses that prioritize customer support. It offers 24/7 live support via web ticket, phone and live chat which is a significant advantage over many competitors.
Key Features: Custom call forwarding, 24/7 support and global coverage in over 100 countries.
Integrations: 8×8 is well-integrated with a variety of business tools and offers seamless compatibility with existing PBX systems.
Pros & Cons
Pros: Excellent customer support, good global coverage, reliable platform.
Cons: Per-channel pricing may be more expensive than usage-based models for some businesses.
Pricing Breakdown: Starts at $25.00 per channel per month plus per-minute charges.
Best For: Companies that value exceptional customer service and support.
Unique Selling Point (USP): Its 24/7 live support is a major differentiator in the industry.
9. Verizon
Overview: Verizon is a trusted name in telecommunications and its SIP trunking solution is designed for larger or growing companies that need a fast and reliable network.
Key Features: Scalable network, enterprise-grade features, and a high-availability network.
Integrations: Verizon’s services integrate with major PBX systems and offer solutions for various business needs.
Pros & Cons:
Pros: Extremely reliable, well-suited for large enterprises, strong network.
Cons: Charges per minute, which can be less predictable, require a custom quote.
Pricing Breakdown: Per-minute pricing, requiring a sales consultation for a custom quote.
Best For: Large enterprises that need a highly reliable and scalable solution from a well-established provider.
Unique Selling Point (USP): Leveraging its massive, reliable network, Verizon is a safe and robust choice for mission-critical communications.
10. Global Call Forwarding
Overview: Global Call Forwarding specializes in providing international SIP trunks enabling businesses to establish a local presence in markets worldwide. It’s an ideal choice for companies with international calling needs.
Key Features: Local caller ID, instant provisioning and partnerships with Tier 1 carriers.
Integrations: The service can be integrated with your existing PBX system without the need for additional hardware.
Pros & Cons
Pros: Extensive global coverage, no commitment, cost-effective for international calls.
Cons: Pricing varies significantly by country.
Pricing Breakdown: Pricing is based on the specific country and call volume, with both monthly and annual subscription options.
Best For: Businesses focused on international expansion that need to make and receive calls from different countries.
Unique Selling Point (USP): Its ability to provide local SIP trunk numbers in over 160 countries is its core strength.
How to Choose the Right SIP Trunking Provider?
- Call quality & uptime: Look for providers with a 99.999% uptime guarantee and a robust, redundant network.
- Number of concurrent call paths: Determine how many simultaneous calls your business needs to support.
- Global/local coverage: Ensure the provider offers coverage in all the regions where your business operates.
- PBX/VoIP compatibility: The provider must be compatible with your existing on-premise or cloud-based PBX system.
- E911 compliance: Make sure the service is compliant with emergency services regulations, especially if you have a distributed workforce.
- Security & encryption: Advanced features like TLS/SRTP encryption and fraud protection are non-negotiable.
- Cost structure: metered vs. unlimited: Choose a pricing model that aligns with your call volume and budget predictability needs.
Best SIP Trunking for Specific Use Cases
- For Small Businesses: Ooma and Nextiva are excellent choices due to their affordability, ease of use and flexible plans.
- For Enterprises: Verizon and Bandwidth offer the scalability, reliability and advanced features required by large organizations.
- For International Calling: Global Call Forwarding is the clear winner with its extensive global coverage and local caller ID capabilities.
- For Integration with Microsoft Teams / Zoom / Cisco: Providers such as Nuwave and Telstra offer solutions designed for seamless integration with these collaboration platforms.
- With Advanced Security: Twilio and SIP.US provide advanced security measures like fraud detection and encryption to protect your communications.
SIP Trunking Pricing Models
- Metered vs. Unmetered: Metered pricing charges per minute, suitable for low call volumes. Unmetered (or unlimited) pricing is a fixed monthly fee per channel, ideal for high call volumes.
- Call Path Pricing: This model charges for each concurrent call path, or channel, you require.
- Monthly fees, setup costs: Be aware of any setup fees, monthly charges for numbers, or other hidden costs.
- Termination vs. Origination: Termination refers to outbound calls, while origination refers to inbound calls. Providers often have different rates for each.
- Free trials or pay-as-you-go models: Look for providers like Twilio that offer pay-as-you-go or free trials to test the service before committing.
- What is SIP trunking used for?
It’s used to connect an IP PBX to the public telephone network over the internet, enabling voice, video, and messaging communications.
- Is SIP trunking better than PRI?
Yes. SIP trunking is more flexible, scalable, and cost-effective than old PRI lines, which are based on rigid physical infrastructure.
- How many call paths do I need?
The number of call paths required depends on your business’s average and peak concurrent call volumes. A common rule of thumb is to have one channel for every 3-5 employees.
- Do I need a PBX to use SIP trunking?
Yes, you need a SIP-enabled PBX system (either on-premise or in the cloud) to use SIP trunking.
- Can I keep my existing number?
In most cases, yes. The process of transferring your number to a new provider is called “number porting.”
- What’s the difference between VoIP and SIP trunking?
VoIP is the technology that turns voice into digital data. At the same time, SIP is the protocol that controls the multimedia sessions (including VoIP calls). SIP trunking is the virtual line that connects your PBX to the internet.
- How secure is SIP trunking?
Modern SIP trunking is highly secure when providers use encryption (TLS/SRTP), fraud detection, and other security protocols.
Conclusion – Which SIP Trunking Should You Choose?
The best SIP trunking provider for your business depends on your specific needs. For small businesses and those on a budget, Ooma offers an unbeatable combination of affordability and ease of use. Suppose your company has a high volume of calls and values predictable monthly costs. In that case, SIP.US‘s flat-rate unlimited calling is a strong contender. For enterprises that need a robust, scalable and highly reliable solution, Verizon and Bandwidth stand out with their powerful networks and advanced features. Ultimately, selecting the right provider involves a careful evaluation of your communication requirements, budget and desired feature set.
