Modern VoIP technologies are increasingly being adopted in the public sector. The West Bohemian city of Pilsen is no exception. Through its organization, the Information Technology Administration of the City of Pilsen (SITMP), IXPERTA has been a trusted expert partner for many years, supporting the IP telephony project serving multiple city institutions.
Initial Situation
The city’s voice network was operated on a mix of outdated and heterogeneous telecommunication systems. This caused operational complications due to frequent incompatibilities between exchanges and led to higher service and maintenance costs.
To address this, the city — represented by SITMP — decided to modernize its entire voice communication system. The primary requirement was a centralized telecommunication system providing all necessary functions and applications on a single, virtualized technology platform.
Given SITMP’s role as the IT service provider for more than 100 city organizations (including the City Hall, municipal districts, transport company, schools, and cultural institutions), high reliability and availability were key requirements.
Proposed Solution: Atos Unify Communication System
IXPERTA selected Unify OpenScape Voice, a native VoIP communication platform from Atos, designed for carrier-class reliability. The solution achieves 99.999% availability — equivalent to less than 5.5 minutes of downtime per year.
Server nodes were designed in a fully redundant architecture, ensuring that in the event of a failure, another node could take over 100% of the operational load without disrupting active calls.
Key Advantages of Atos Unify Technology
Next-Gen VoIP
fully based on open SIP protocols
Redundant Hardware
ensuring maximum uptime
Full Virtualization
all applications run on a virtualized platform
By the Numbers
- 99.999% reliability carrier-grade availability guaranteed by redundant server architecture
- 2,700 lines current capacity of the central voice system
- 6,000 lines target capacity of the central voice system
Project Implementation
Since 2014, IXPERTA has been continuously implementing and expanding the project, covering:
Design & Budgeting
technical architecture and cost planning
Delivery
supply of technology and software licenses
Implementation
system deployment and testing
Support
upgrades and vendor support services
One of the main challenges was the gradual migration of users from various legacy telephone exchanges to a unified central system (OpenScape Voice) — a process that took place over several years.
The rollout continues as the central virtual exchange is expanded to cover additional organizations managed by SITMP. Ultimately, the solution will provide centralized IP telephony for 100% of all city institutions.
Client Satisfaction
SITMP values the benefits of a centralized, virtualized voice system with unified administration and monitoring, hosted fully within its own data centers. Staff are trained on the OpenScape Voice platform and are able to manage most operations independently.
Client Testimonial
“IXPERTA’s IP telephony solution is reliable and stable. A single centralized virtual exchange supports all our lines and has significantly reduced maintenance and hardware service costs. IXPERTA always responds quickly and professionally to our needs.”
Ing. Libor Červený, Director of Infrastructure, SITMP
About the City of Pilsen & SITMP
Pilsen is the fourth-largest city in the Czech Republic, with nearly 170,000 inhabitants. SITMP is responsible for providing IT services — including voice communications — to more than 100 organizations under the city’s administration, including government offices, municipal districts, schools, theaters, and transport services.
About IXPERTA
For more than 30 years, IXPERTA has been delivering comprehensive IT and communication solutions across the Czech Republic, Slovakia, and internationally — with proven success in Europe, Asia, and North America.
Our expertise spans enterprise communications, IT infrastructure, cybersecurity, and custom software development. We have implemented hundreds of communication solutions and are a certified provider of Atos Unify voice communication technologies.
Published: 3. September 2025
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