Upgrade your PBX for on-demand scaling, top call quality, and growth-ready networking.
SIP Trunking
Scale your business phone system with confidence
Why Choose Momentum?
Communications consistent with your company's needs
Stay operational during high-demand periods and support long-term growth with Momentum’s SIP trunking solution. Our solution is compatible with most certified PBX vendors, including Avaya, Mitel, Cisco, ShoreTel, and Panasonic — offering:
- Transparent usage-based pricing
- Unlimited domestic calling
- Global number coverage
- Instant, on-demand scalability
Trusted by 30,000+ locations globally
Enable flexible and more reliable communication
E911 support
Ensure your organization is prepared for emergencies and compliant with regulations with full 911 and E911 functionality.
Trusted infrastructure
Momentum’s carrier-grade, geo-redundant network is trusted by corporations and carriers located throughout the world.
High-touch support
Take control of your communications with 24×7, on-demand high-touch support from our team of SIP trunking experts.
Designed for reliability
Backed by our global network, our SIP trunking service is considerably more reliable than most primary rate interfaces (PRIs).
Your one-stop shop
Momentum offers a comprehensive portfolio of synergistic services, including SD-WAN, Cloud Voice, Teams Phone, and more.
Global scalability
Momentum owns the entirety of our global network and has the capacity to install our own circuits, enabling unprecedented coverage.
Breathe new life into your legacy PBX infrastructure
Create a scalable, easy-to-manage communications network with our flexible SIP trunking service. Momentum will provide you with a digital service to support all your network routing needs, with benefits that include:
- Multi-site deployments to support both regional and global growth
- Compatibility with Momentum Cloud Voice to enable feature-rich calling
- Leveraging existing infrastructure to eliminate the need for upgrades
- Custom routing to support your call flow and networking needs
Your partner in business collaboration
Momentum empowers your business with the tools it needs to thrive. Enhance productivity and drive growth with custom solutions for connectivity, communication, engagement, and more.
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related products
Explore Momentum's other collaboration solutions
Interested in exploring other ways your business can optimize its PBX and Teams deployments? Have a look at some of our other offerings below.
Teams Phone
Integrate enterprise-grade PBX functionality into Microsoft Teams with a direct connection to the PSTN.
Cloud Voice
Modernize your communications infrastructure with a feature-rich cloud solution.
Operator Connect
Transform Microsoft Teams into a full-featured business phone solution with simplified management.
Maximize the value of your PBX investment with Momentum
Enhance your business phone system with a SIP trunk that’s built to scale while accessing a diverse portfolio of additional communications and connectivity services.
FAQ
SIP Trunking frequently asked questions
What is SIP Trunking?
SIP Trunking is a method of delivering voice and other communication services over the internet using the Session Initiation Protocol (SIP). It replaces traditional analog phone lines (PRIs and POTS lines) by connecting your existing Private Branch Exchange (PBX) to the Public Switched Telephone Network (PSTN) through an internet connection. SIP Trunking allows organizations to retain their current PBX infrastructure while gaining modern scalability and cost efficiencies.
How does SIP Trunking differ from traditional phone lines?
Traditional phone lines use physical copper connections to transmit voice calls, with capacity limited by the number of lines installed. SIP Trunking uses the internet to transmit voice data, which provides greater flexibility, easier scalability, and typically lower costs. Unlike traditional lines that require hardware changes to add capacity, SIP trunks can be scaled on demand through a provider dashboard, making it easier to adjust to changing call volumes.
What are the benefits of using SIP Trunking?
SIP Trunking delivers cost savings by replacing expensive traditional phone lines with internet-based connections. Additional benefits include on-demand scalability, compatibility with most certified PBX systems, improved call quality through a carrier-grade network, unlimited domestic calling options, and the ability to support multi-site deployments with centralized management. It also integrates with other communication services like Cloud Voice and Microsoft Teams.
How does SIP Trunking handle emergency calls?
SIP Trunking providers route emergency calls (911 and E911) to the appropriate Public Safety Answering Point (PSAP) based on the caller’s registered location. To ensure emergency calls are routed accurately, organizations must keep their location information updated with their provider. Compliance with regulations like Kari’s Law and RAY BAUM’s Act is also supported by reputable SIP Trunking providers.
Is SIP Trunking secure?
SIP Trunking security depends on the provider and implementation. A well-configured SIP trunk uses encryption protocols such as TLS and SRTP, runs over a secure private network, and is supported by enterprise-grade firewalls and monitoring. Working with a reputable provider that operates its own carrier-grade infrastructure is the most effective way to ensure your SIP Trunking service is protected against eavesdropping, fraud, and unauthorized access.
How is call quality managed in SIP Trunking?
Call quality in a SIP Trunking environment is influenced by internet bandwidth, network stability, and Quality of Service (QoS) configurations. Providers with their own carrier-grade network infrastructure can prioritize voice traffic and reduce latency, jitter, and packet loss. Momentum operates a geo-redundant global network with over 200 points of presence, ensuring high-quality voice performance even during peak usage.
