SIP Trunking

Your legacy phone system. Our cloud. Connected.

Session Initiation Protocol (SIP) Trunking, is a cost-effective technology that connects legacy phones and systems to the cloud without removing or replacing them. With SIP trunking, Vonage makes it easy to convert legacy phone systems and get cloud-hosted voice, video, data, text and other unified communications using the scalability of the internet or the power of our private managed network.

Key Benefits

  • Nationwide coverage for quality, disaster recovery & business continuity, diversity, etc.
  • Redundant Ring Architecture
  • National IP Routing Fabric
  • Multiple Access Options-Ethernet, Dsi, T1, DS3, OCN
  • Multi-site MPLS VPN
  • End-to-End Quality of Service (QOS)
  • 2 Domestic 24x7 NOC's with proactive monitoring and support

Nationwide MPLS Network

Data Centers

PSTN Gateway

Internet/IP Hub


Super POP

QoS on a private managed circuit

Vonage Premier has one of the largest private MPLS networks in the country. With SIP Trunk over this dedicated MPLS network, you can get elevated quality of service and cloud capabilities on your traditional PBX system. You’ll get four-digit dialing between legacy PBX and the Vonage network users, impeccable call quality, and so much more.

Robust features with high-speed internet

With SIP Trunk over a high-speed internet, you can access 40+ business critical phone features and other Vonage cloud capabilities on your traditional PBX system. You can even keep your phones. As a top SIP Trunk provider, Vonage Business offers private SIP interoperability with Microsoft® Lync®, Cisco® Call Manager, Avaya®, Asterisk®, Zultys®, and more.

More affordable scalability, call trafficking, and disaster recovery

By getting rid of voice and data hardware systems, SIP Trunking can lower your total cost of ownership. Many Primary Rate Interface (PRI) systems require the purchase of 23 channels at a time. SIP Trunks can be purchased individually so scaling up or down is simple. As a top SIP Trunk provider, we also design solutions to handle high call volume and automatic call rerouting important if there’s problem on a circuit.


Vonage SIP Trunks

Virtual connection (voice & data transmission)

One at a time purchase (good scalability)

Business continuity/disaster recovery via automatic call rerouting in the cloud

Little to no hardware investment for deployment

Traditional PRI systems

Physical connection over a dedicated line (only voice transmission)

Requires purchase of up to 23 channels at a time

Call diversion and rerouting possible (complex setup and expensive maintenance)

Up-front investment in hardware for deployment

Turn your legacy phone system into a communications powerhouse.
Consolidate & save
Say goodbye to expensive PSTN gateways, multiple providers, and local voice trunks. Vonage Business gives you nationwide coverage, all under a single account.
Accommodate volume spikes
SIP Trunks “burstable” feature, temporarily allows for more trunk channels than provisioned. So, even during peak volume, your customer’s calls get to you.
Business continuity & better uptime
SIP Trunking features reside in the Vonage geo-redundant cloud rather than at your office. In the event of a disaster, calls can be redirected to an unaffected location.


Reimagine how business gets done

From cloud-hosted phones on your current broadband to UCaaS solutions on a dedicated network, Vonage is partnering with businesses like yours, in ways never imagined. Cost-effective ways. Revenue-building ways. Once thought impossible ways.

Vonage® Essentials
Robust, intuitive, and small business friendly:

Runs on your high-speed internet connection

40+ features to help you customize your business communications

Mobile and desktop applications enable mobile working and virtual teams

High-quality voice, point to point video, and messaging

Includes the Amazon Chime Pro tier, offering chat, screen share, video and web conferencing

Integrates with the business applications you use everyday

Easily scales as your business grows

Simple activation and setup with 24/7 customer support

Month-to-month contracts available

Vonage® Premier
Enterprise-grade unified communications:

Enterprise-grade unified communications

Hybrid network and bring your own broadband options with SD-WAN

One of the nation’s largest purpose-built MPLS networks

Elevated quality of service for voice, video, and data communications

Advanced features including conferencing for up to 300 users

Mobile and desktop applications enable mobile working and virtual teams

Reliable and scalable solutions for inbound, outbound, and multi-site contact centers

Deep integration ties phone service to top business applications

End-to-end managed installation and dedicated service teams

Call for a free consultation from a business phone system specialist.

Anytime between 8AM - 9PM ET

Or, tell us about your business and a specialist will get in touch.

There was a problem with some of your entries. Please correct the fields marked above.

Thank You.
A specialist will contact you soon.

You can contact us any time by calling 1.877.862.2562 or email

Get a Quote
Request a Free Quote

There was a problem with some of your entries. Please correct the fields marked above.

Thank You.
A specialist will contact you soon.

You can contact us any time by calling 1.877.862.2562 or email

Buy Now