10 Best SIP Trunking Service Providers in 2026

Twilio, Nextiva, Bandwidth, Vonage, SIP.US and Unitel Voice are some of the best SIP trunking service providers in 2026.

Broadvoice is a cloud communication platform that offers SIP trunking service to modernize your phone system without replacing your existing setup. You get essential features like voicemail, caller ID, virtual numbers, call recording, and call analytics, all accessible through a single management portal. Likewise, if your call volume fluctuates, its call bursting capability automatically changes capacity so you don’t miss critical customer interactions. Broadvoice also makes it easy to manage multiple locations and user preferences, which can be especially helpful if your team operates in different offices. Since SIP trunking is offered alongside its larger portfolio of Unified Communication as a Service (UCaaS) and contact center tools, you can integrate more services as your communication needs grow.

Key Features

• Unlimited SIP trunk options
• International Direct Inward Dialing (DID)
• On-site installation and training
• User-level phone preference control

Pricing (Per month/user)

• Metered Trunk: $11 for 5,000 outbound minutes, 2.9 cents per minute if outbound minutes exceed 5000
• Unlimited Trunk: $17 for unlimited outbound calling

Twilio is a global Communication Platform as a Service (CPaaS) solution that offers one of the best SIP trunking services with on-demand scalability and extensive global reach. So, it is especially beneficial if you have a business operating across multiple regions. Plus, the service adjusts capacity automatically, giving you a reliable way to manage fluctuating call volumes without manual configuration.
Twilio also simplifies cost management with pay-as-you-go pricing and optional committed-use discounts. Likewise, you can strengthen communication further with built-in safeguards like disaster recovery routing and fraud prevention. For organizations with established infrastructure, Twilio supports Bring-Your-Own-Carrier (BYOC) setups so you can adopt its global Public Switched Telephone Network (PSTN) access without replacing your existing carrier arrangements.

Key Features

• Global routing support
• Private connectivity via Twilio Interconnect
• Real-time call monitoring with Voice Insights
• Support for replacing legacy phone systems
• Prebuilt configurations for Unified Communication (UC) and contact center platforms

Pricing (Pay as You Go)

• Outbound calling starts at $0.0011/min
• Inbound calling: Local numbers at $0.0034/min, toll-free at $0.0130/min
• Local phone numbers: $1.15/month
• Toll-free numbers: $2.15/month
• Optional add-ons include call recording ($0.0025/min) and advanced SIP Insights ($0.0024/min)

Nextiva, a customer experience management platform, provides SIP trunk service as a part of its wide range of services. It stands out among other providers because of its emphasis on reliability and straightforward Private Branch Exchange (PBX) connectivity. Additionally, Nextiva focuses on giving you a stable voice foundation with minimal configuration required. Its SIP trunking runs on a network supported by multiple US data centers, which helps maintain call continuity even when one route goes down. Plus, day-to-day tasks like updating credentials, assigning DIDs, or reviewing call detail records can be handled in a browser-based portal that avoids the complexity of command-line tools.

Key Features

• Fraud monitoring and alerting
• Automatic failover routing
• Same-day deployment with ready-to-use SIP trunks
• Wide compatibility with major PBX systems

Pricing (Per month)

• Metered Trunking: $14.95 for 100 minutes included, $0.008 per minute for extra minutes
• Unmetered Trunking: $24.95 for unlimited calls nationwide

Bandwidth is among the top SIP trunk service providers, which operates as a licensed carrier with its own all-IP voice network. As a result, it gives you direct access to the infrastructure rather than routing calls through third parties. Consequently, this makes it a great option if you want a single provider to standardize calling across different regions.
Bandwidth also supports more complex needs, such as managing large sets of phone numbers or coordinating migrations when you’re switching providers. Additionally, its SIP trunking service connects smoothly with enterprise environments that rely on different communication systems, letting you build around the tools you already use.

Key Features

• Direct-to-carrier connectivity
• Multi-region emergency calling compliance
• Large-scale number porting tools
• 24/7 continuous network monitoring

Pricing

• The pricing is not provided on the official website. So, contact the customer support for pricing details.

Vonage is a global cloud communications provider that offers SIP trunking built on a stable, carrier-grade global network. Consequently, it gives you dependable call quality, consistent uptime, and the ability to scale call capacity as your business grows. Further, its SIP services are designed to integrate smoothly with a wide range of on-premises and cloud-based PBX systems, making it straightforward to modernize your existing phone system.
Likewise, you get flexible call routing, support for local and international numbers, and the reliability needed for high-volume calling across regions. Vonage’s long-standing presence in cloud communications adds a layer of stability. So, it is a practical choice if you’re looking for SIP trunking that prioritizes quality, compatibility, and global reach without unnecessary complexity.

Key Features

• High-volume call capacity
• Wide PBX compatibility
• Local and international number availability
• Broad geographic coverage

Pricing

• The pricing is not provided on the official website. So, contact the customer support for pricing details.

SIP.US ranks among the top SIP trunk service providers as it offers a practical way to modernize your phone system with a simple setup and easy management. Using the service, you can activate trunks instantly, add or remove channels whenever needed, and control everything through a fully automated online dashboard.Additionally, it supports any SIP-enabled PBX, legacy or cloud, so you can keep your existing hardware while upgrading reliability and call quality. With a Tier-1 redundant network, real-time call records, and built-in toll-fraud protection, SIP.US is designed to keep your call traffic stable and secure without overcomplicating your setup.

Key Features

• Real-time call data records
• Broad PBX and SIP device compatibility
• Fraud protection with automatic blocking
• Wide range of DID coverage

Pricing

• SIP Channels: $24.95 per channel/month
• Local DIDs: $1.00 per number/month + $1.00 setup fee
• Toll-Free DIDs: $2.95 per number/month + $0.02/minute + $3.00 setup fee
• Enhanced DIDs (with E911): $2.50 per number/month + $2.00 setup fee
• Number Porting: No monthly fee; $10 per number port-in

Unitel Voice is one of the top SIP trunking service providers as it gives you a straightforward, pay-as-you-go option designed to keep your costs low while maintaining dependable call quality. In fact, you can use your existing PBX, bring your own equipment, and scale your usage without contracts, setup fees, or minimum commitments.Its network is built with geographic redundancy and monitored constantly, giving you the reliability you need for business-critical calling. Furthermore, you also get a dedicated account manager who ensures you always have direct support when any issue arises. If you’re looking for SIP trunking that’s easy to adopt, budget-friendly, and backed by technical assistance, Unitel Voice is a good option.

Key Features

• Tier-1 network centers for high call quality
• Free professional SIP consultation
• No fees for number porting
• Supports both toll-free and local numbers

Pricing

• Inbound (Local Numbers): Starting at $0.0045/min
• Inbound (Toll-Free Numbers): $0.0180/min
• Outbound Calls: Starting at $0.0069/min
• Phone Numbers (Local or Toll-Free): $1/month per number
• E911 Fee: $1/month per number
• Caller ID Name (CNAM) Fee: $1/month (optional)

Telnyx stands among the best SIP trunk providers as it offers SIP trunking on a private, multi-cloud network. So, it is an ideal option if your business requires consistent call quality, low latency, and global scalability. Further, you can deploy and manage SIP trunks through a self-service portal, scale capacity on demand, and maintain control as call volumes change.

The platform includes detailed call debugging tools that give you full visibility into signaling, media, and routing, making it easier to troubleshoot issues in real time. Further, you can also use inbound call screening to filter unwanted traffic and protect the integrity of your calls. With infrastructure designed to avoid the public internet, Telnyx is well-suited for organizations that depend on high-performance SIP connectivity.

Key Features

• E911 support compliant
• Automatic call recording by number
• BYOC support for UC platforms
• API-driven provisioning and automation

Pricing (Pay-as-you-go Plan)

• Outbound Calls (US):
  1. Local: Starting at $0.005/min
  2. Toll-free: Free
• Inbound Calls (US):
  1. Local: Starting at $0.0035/min
  2. Toll-free: Starting at $0.015/min
• Emergency Calling (E911): $1.50/month per number
• Call Recording: $0.002/min (storage included)

Telnyx also offers volume-based pricing. But you have to provide your name and email address on their website to get the pricing details.

net2phone offers one of the top SIP trunking services designed to help you modernize voice communications without replacing your existing PBX or phone system. In fact, the service is built to support high call volumes with consistent quality, backed by a global network and strong uptime. Additionally, it supports both local and international calling from a single provider. net2phone also emphasizes compatibility, working with a wide range of certified IP-PBX systems, which makes it easier to deploy SIP trunking across distributed locations. With decades of telecom experience behind the platform, net2phone is a solid option if you want a globally available SIP trunking service supported by hands-on onboarding and ongoing assistance.

Key Features

• Self-service trunk and number management portal
• Caller ID and call routing configuration
• Location-based address management for E911
• Detailed call records and usage analytics
• Broad international number availability

Pricing

• The pricing is not provided on the official website. So, contact the customer support for pricing details.

Plivo’s Zentrunk is a cloud-based SIP trunking service, built for businesses that handle large volumes of global voice traffic and need consistent performance across regions. Using this service, you can place and receive calls without worrying about channel limits, making it easier to support distributed operations. Furthermore, the calls are routed directly through local carriers using one-hop termination, which helps reduce post-dial delay and improve call clarity. With outbound coverage spanning over 220 countries and inbound number availability in more than 70, Plivo stands out for its international reach. So, if your SIP trunking needs extend beyond domestic calling and require global scale with predictable quality, Plivo offers a focused, carrier-grade solution.

Key Features

• Unlimited concurrent inbound and outbound calls
• Separate SIP domains per trunk
• Strong encryption support
• Automated fraud detection and alerts

Pricing

• The pricing is not provided on the official website. So, contact the customer support for pricing details.

When choosing a SIP trunk provider, prioritize clear call quality and stable uptime. Also, look for services that offer easy scalability, transparent pricing that matches service value, and responsive customer support to ensure smooth, reliable communication.

• Call Quality: Check if the SIP trunk provider ensures clear voice calls without disruptions or delays. This is because call quality plays an essential role in maintaining professional communication standards.
• Reliability: To ensure communication runs smoothly at all times without hampering company calls, look for a service provider that offers reliable service with minimal downtime. This ensures customers can reach your business without failed or dropped calls.
• Scalability: Choose SIP providers that offer scalability. For instance, adding lines as your business grows or seasonal demand fluctuates. So, it helps you manage costs effectively without compromising service quality.
• Cost-effectiveness: Look for providers that offer transparent and flexible pricing models, such as pay-as-you-go. Even though SIP trunking is generally cheaper than traditional phone lines, you should check if the performance, reliability, and support justify the cost.
• Global Coverage: If your company operates internationally, ensure the SIP trunk provider offers global coverage at competitive rates for international calls. It also includes supporting local numbers in multiple countries.
• Security: Make sure the SIP trunk provider includes strong security measures such as encryption, fraud detection, and access controls. These safeguards help protect your calls, data, and network from unauthorized access or misuse.
• Customer Support: Reliable support can make a significant difference, especially during setup or unexpected issues. So, choose a provider that offers responsive, knowledgeable assistance and clear support channels to keep your communications running smoothly.

SIP trunking offers a practical and cost-effective way to modernize business communication without abandoning your existing PBX infrastructure. By replacing traditional phone lines with internet-based calling, it delivers better flexibility, scalability, and call quality while keeping costs under control. As highlighted in this guide, each SIP trunk provider brings its own strengths, whether it’s global reach, pay-as-you-go pricing, advanced analytics, or enterprise-grade reliability.

Ultimately, the right SIP trunk service provider depends on your business size, call volume, geographic needs, budget, and technical requirements. By carefully evaluating factors like reliability, pricing transparency, scalability, security, and customer support, you can confidently choose a solution that supports both your current operations and future growth. With the right provider in place, SIP trunking can become a strong foundation for efficient, reliable, and scalable business communication.