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Welcome to Call Systems Technology (CST), where innovation meets communication.

With a rich legacy spanning over 25 years, CST has been a trailblazer in providing cutting-edge communication and critical alert solutions to various industries. We take pride in our partnerships with passionate individuals and organizations, shaping the future of communication together. 


Transition from Alvoko

In light of recent changes, we understand the challenges faced by their valued customers. As of December 31, 2023, Alvoko will cease its operations. During this transition, we want to assure you that CST is here to help provide continued support.

Contact CST: 

Sonia Mizner - Export & Partner Co-Ordinator 

Extension 230 (en Français) 

+44(0)20 8381 1338
[email protected]

Lundi a Vendredi 

09:00 a 17:00 (Londres, UK)   

Bureau: +44 208 381 1338 (Réponse automatique / Anglais) 

Mobile/WhatsApp: +44 7561 709561 (en Français) 


Our Expertise

CST specializes in pioneering solutions that empower industries worldwide. From corporate enterprises to hotels, marine, education, healthcare, industry and retail establishments. We cater to diverse sectors. Our comprehensive product range includes wireless call points, critical alert messaging, ‘call for service‘ buttons, paging systems, two-way radios and our advanced Gen2 messaging and alarm monitoring software. 





Global Presence

Operating both directly to end-users and through our partner network, CST supplies over 40,000 sites. We proudly serve 20 European resellers with a larger global footprint in more than 50 countries. CST solutions are not just industry-tested; they are industry-approved. Our focus is helping clients enhance communication, boost productivity and deliver exceptional customer service across diverse sectors. 


Our Commitment

At CST, we are more than just technology providers; we are your partners in success. With over 100 years of combined technical experience, our dedicated team is committed to delivering first-class ROI solutions. We offer expert consultancy, unparalleled support, and pioneering technology to our clients, ensuring they receive world-class customer care every step of the way.