Olisia Ltd is rated 3 out of 5 in the category computer & network security. Read and write reviews about Olisia Ltd. Providing Network and Security Consultancy Services in the UK. Specialists in Network Switching/Routing/Firewall and Load Balancing Design and Implementation. Multi Vendor Experience, including (but not limited to) Cisco, F5, Checkpoint, Meraki. Extensive VOIP deployment expertise.