Back to Blog
Tech

Hosted PBX and Virtualization

Published on:

January 4, 2014

In 2014, the hosted PBX industry gained more clarity on key technologies, with virtualization becoming crucial. Virtualization allows several servers to run on the same hardware, making the process faster and more efficient and offering robust failover mechanisms to maintain service, even during hardware failures. Unlike traditional services, PBX systems require real-time response times measured in milliseconds, which means virtual machines must have exclusive CPU control. Vodia’s multi-tenant solution enables the efficient use of resources, offering a scalable hosted PBX service with minimal disruption while keeping deployment costs low and allowing rapid expansion.

Christian Stredicke

It is 2014 and we have a clearer picture of what's important in the hosted PBX business.

Virtualization is one of the key technologies in the server world, which is also sometimes referred to as the “cloud”. It makes it possible to run several servers on the same physical hardware. This makes it possible not only to run servers more efficiently, but to also automatically set up those servers in a matter of seconds without human interaction.

When it comes to the PBX and virtualization there are a few things to consider. In contrast to HTTP and other services, the hosted PBX demands real-time reaction times in the area of milliseconds. This has several important implications that make the difference between mediocre and excellent service.

Virtualization makes it possible to implement an extremely robust failover mechanism that continues service on the same IP addresses even if the hardware crashes. This not only makes it possible to have “eternal” services, it also makes it possible to upgrade the underlying hardware while the service is active. With this technology, calls may stay up - even if they are, for example, in an ACD with minimal service disruption.

Because of the real-time requirements, the hosted PBX virtual machine needs to have exclusive control over the CPU running the virtual host. This means that practically one CPU core can run one virtual machine, something we already saw in 2005 when the pbxnsip project was initiated. It makes it possible to have hundreds of customers running on the same CPU core in a virtual environment. Other PBX solutions designed as single domain solutions need one virtual machine for each customer, even if there are only two extensions on it. This causes a lot higher resource usage, thus higher costs. Additionally, while we are still using IPv4, it also needs a lot more valuable IPv4 addresses than the multi-tenant solution.

The other implication of the real-time nature of the hosted PBX is vicinity. It isn't possible to serve large areas with one big data center. Instead, the virtual machines need to be located close to the customers, with “close” being defined by the ping times. Here the cost of deploying a hosted PBX is a key issue. With the simple architecture of the Vodia PBX, we are in a good position to serve customers all over the world. A new PBX can be deployed in a matter of minutes and even automatically, just like a new virtual machine can be deployed today.

Latest Articles

View All
Tech

The Vodia PBX and SAML Integration

Vodia PBX now supports SAML integration, offering a secure and standards-based method for enterprise users to access their phone system through single sign-on. SAML, or Security Assertion Markup Language, allows employees to authenticate in one system and access other systems without managing multiple passwords, improving both security and user experience. By exchanging digitally signed SAML Assertions between Identity Providers and Service Providers, Vodia ensures seamless authentication across internal and external applications. With this integration, IT teams can simplify user management, reduce login complexity, and maintain strong security controls for business communications.

September 2, 2025
Editorial

Rethinking Communication in Education: Vodia Smart School

Digital communication is now woven into daily school life, from classroom platforms to how parents and teachers connect. Vodia Smart School takes this further with a VoIP-powered system that provides fast, secure, and documented communication for consent forms, sick notes, and routine notifications. In urgent situations, it enables automated alerts to staff, parents, and first responders, ensuring rapid responses when time is critical. Fully GDPR-compliant and offering features such as caller ID masking, MS Teams integration, and control of bells, announcements, and school systems, Smart School gives schools a modern, reliable alternative to legacy systems while improving both safety and everyday operations.

August 28, 2025
Announcement

Vodia Now Integrates with Microsoft Teams Presence

Vodia PBX now supports Microsoft Teams Presence, building on its Teams Direct Routing certification and Dynamics 365 integration. Using Graph API from version 69.5.13, a user’s Vodia extension is automatically set to Do Not Disturb when they are on a Teams call. Presence status such as Available, Away, Busy, In a Meeting, or Presenting is matched via the Teams user’s principal username or email, allowing VoIP phones and web portals to show real-time status across devices. This integration connects Teams with a full-featured SIP-compliant PBX, enabling organizations to unify communications, streamline workflows, and support both cloud and on-premise telephony solutions.

August 25, 2025