Scriptable VoIP Platform,
Stack it your way.

Next generation, multi-tenant & elastic — Built for VoIP integrators, designed for all.

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  • By signing up, you agree to the Terms of Service
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    and see how SIPSTACK brings VoIP to the next level

    Feature Stacked

    SIP Trunks

    For traditional, on premise IP based PBX systems, or direct use with a SIP device or app, IP Lines & SIP Trunking tools built-in.

    Hosted PBX

    Cloud based phone services for your business. No onsite PBX required. Highly scalable. Highly Customizable. Layered Security!

    Virtual Fax

    Send & receive faxes by email. The quickest and easiest way to manage single or multiple fax lines all from one unified system.

    Conference Bridge

    A conference bridge solution finally built the right way. Integrated across all system features and accessible globally.

    • Multi Tenant

      SIPSTACK allows Internet Telephony Service Providers to setup and manage multiple independent PBXs within a single portal to offer their customers powerful PBX features in a secure hosted environment.

      SIPSTACK offers ease of service provisioning and management to service providers and advanced functionality to their customers.

    • Scriptable

      SIPSTACK's "stackable" infrastructure allows providers to easilty setup custom scripts (stacklets) on every service. Go beyond basic call routing and create simple or complex scripts to run when a service is called or executed.

      For example, if your customer or user requires advanced functions when their phone rings, you can now create custom stacklets to perform those tasks, such as call an external API, auto record call and email one call ends or even auto update external CRM systems based on call information.

    • Free Features

      SIPSTACK includes all features required in a PBX system at no cost. You can provision entire offices, configure phones and routes as needed, call internally all before any charges are incurred. Only pay for usage and traffic when calls are coming in or out of the sytem. Phone numbers and emergency addons are also changed upon activating those services.

      No contracts, no commitment... To get started, create an account and start setting up your voice services. When ready to connect to the outside world, add funds to enable inbound and outbound routes.

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    Straight forward pricing

    Pay only for resources you actually use. No setup fee, no minimum spend.

    •    Get started without credit cards
    •    Volume discounts based on usage
    •    Free unlimited internal calling
    •    Share & earn referral system
    •    Dedicated & Community supported



    All SIPSTACK services allow you to create as many devices & services you need!
    (Free forever!)

    *Call usage, DID's and e911 fees are applicable. See Rates >

    Tools to help you optimize

    • Guided Tours

      Not only do we have a huge online repository of articles, guides and video tutorials, every page has a guided tour built right in to help get your phone system working quick and easy without switching pages.

    • Beautiful Reports

      Designed with you in mind. Access call logs, recordings, faxes, call analysis, destination and spend view in an easy and beautiful way. Export reports to your analytical software in just a click.

    • Team Accounts

      Invite team members to access and manage various areas of your PolarFlake system. Billing managers can handle payments and reports, while admins can support and control all areas of your phone system.

    Deploy a Cloud PBX in 25 seconds!

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