SIP Trunking Services for Flexible Business Calling

Elastic SIP trunking from VirPhone replaces rigid PRI lines with scalable, month-to-month voice channels — unlimited US & Canada calling, built-in failover, wholesale rates, and compatibility with every major PBX platform.

Affordable, scalable SIP trunking with burstable capacity, secure HIPAA-compliant faxing, and zero long-term contracts.

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Affordable and scalable SIP trunking through VirPhone

VirPhone's SIP trunking is designed to be easy to configure and manage, with per-channel burstable trunks that adapt to your needs. You can set up trunks, add as many inbound numbers as you want, or port existing ones—quickly and without complexity.

Unlimited calling across the US48, Hawaii, and Canada
Automated provisioning for any SIP-enabled PBX system

VirPhone SIP Trunking Features

Built-in failover

Automatically reroute inbound calls to mobile phones or alternate sites if your primary PBX loses connectivity.

Direct inward dialing (DID)

Assign direct, private phone numbers to specific employees without purchasing individual physical lines.

Enhanced 911 (e911)

Maintain absolute compliance by dynamically assigning physical emergency addresses to your outbound routes.

Remote call forwarding

Establish a local presence in distant area codes by forwarding virtual regional numbers to your main office.

SMS / MMS messaging

Enable text messaging directly on your business DID numbers, communicating with customers where they prefer.

Number porting

Keep your established corporate identity by seamlessly migrating numbers from any US or Canadian carrier.

Compatible with Every Major PBX Platform

SIP Trunking for Asterisk

VirPhone trunks integrate seamlessly with Asterisk-based PBX deployments. Our standard SIP protocol support works out of the box with FreePBX, Issabel, and all Asterisk variants.

SIP Trunking for 3CX

Connect your 3CX system to VirPhone's network for reliable, cost-effective calling. Our team provides dedicated 3CX configuration guides.

SIP Trunking for FreeSWITCH

Full compatibility with FreeSWITCH-based platforms including FusionPBX. Enterprise-grade trunk connectivity with burstable capacity.

SIP Trunking for Cisco

Deploy SIP trunks with Cisco CUCM, CME, and Webex Calling. Our engineering team provides Cisco-specific provisioning support.

SIP Trunking for On-Prem PBX

Any standards-based SIP PBX can connect to VirPhone trunks. We support Avaya, Mitel, NEC, and all modern IP-PBX platforms.

SIP Trunking for Microsoft Teams

Direct Routing integration for Microsoft Teams allows you to use VirPhone trunks directly with your Teams environment for native calling.

Reliable VoIP savings and secure fax solutions

VirPhone SIP Trunking delivers guaranteed savings with most modern PBX systems. Add HIPAA-compliant cloud faxing for secure e-fax.

SIP Trunking for Every Industry

Healthcare

HIPAA-conscious calling, secure fax, compliant recording.

Call Centers

Burstable trunks for peak volumes, advanced routing.

Legal

Confidential calling, call recording, compliance.

Multi-Location

Unified trunking across sites, centralized management.

Traditional PSTN vs SIP Trunking

Why it's time to move your business communications to the cloud.

Traditional PRI / Analog Lines

Rigid physical increments (buying 23 channels at a time)
Expensive multi-year contracts with early termination penalties
Prone to local physical disruption and hardware failure
High per-minute fees for long-distance calling

VirPhone SIP Trunking

Scale exactly what you need with single trunk additions
Flexible month-to-month terms without commitments
Automated cloud failover to mobile or secondary sites
Unlimited US & Canada calling included

Reliable and secure business faxing

VirPhone's Cloud Fax brings cloud-based, HIPAA-compliant faxing to your existing analog machines with no upgrades required.

The pre-provisioned cloud fax appliance is plug-and-play with no firewall changes or proxies needed.
Optimized for low-bandwidth environments, our cloud fax operates at speeds as low as 2kbps, making it ideal for satellite carriers and offshore industries.

Why choose VirPhone for SIP Trunking

Enterprise Expertise

Expertise you can trust from a recognized and certified provider.

White-Glove Setup

We handle the entire transition so you can focus on your business.

24/7 US-Based Support

Get help when you need it from our dedicated, stateside technical team.

No Hidden Fees

Transparent pricing without unexpected charges or confusing invoices.

Predictable Monthly Billing

Easily budget for your communications with flat-rate plans.

Free Consultation

Let us analyze your current setup and propose a better solution at no cost.

Enterprise-Grade

Uptime Reliability

Millions

Minutes per Day

Zero

Contracts Required

Unlim.

US & Canada Voice

Frequently Asked Questions

SIP Trunking replaces traditional analog phone lines or PRIs with virtual lines routed over your internet connection. This provides a vastly more scalable, flexible, and cost-effective way to connect your on-premise PBX to the outside world.

VirPhone SIP Trunking serves as a standard SIP provider, meaning it's fully compatible with any modern SIP-enabled IP-PBX or gateway on the market.

Yes. Our expert porting department handles the seamless transition of your existing local, toll-free, and fax numbers to VirPhone's network in compliance with all FCC regulations, ensuring no downtime.

In the event your PBX goes offline due to power loss or local internet failure, the VirPhone network automatically detects the loss of registration and reroutes incoming calls to a designated mobile number, external landline, or alternate site instantly.

We provide fully compliant E911 services. You can assign specific physical addresses to your Direct Inward Dialing (DID) numbers directly via the portal, ensuring emergency responders always know where to send help.

Burstable trunks mean you are never hard-capped by your purchased concurrent call limit. If you experience an unexpected spike in call volume, the system allows overflow calls to process (at a nominal per-minute rate) rather than sending your customers a busy signal.

Yes, VirPhone offers Microsoft Teams Direct Routing integration, allowing you to use your trunks directly with Microsoft Teams for seamless calling through your existing Teams interface.

Standard fax over SIP (T.38) can be unreliable due to packet loss. Our cloud fax solution uses a proprietary HTTPS encapsulation method providing 100% reliable, HIPAA-compliant cloud faxing that works perfectly over any internet connection.

No. VirPhone SIP Trunking is a month-to-month service with no required long-term commitments, providing you maximum financial flexibility to scale up or down as your business dictates.

VirPhone leverages multiple geo-redundant datacenters, robust IP authentication, fraud detection heuristics, and optional TLS/SRTP encryption to ensure your traffic is protected against unauthorized access and toll fraud.