The Modulis ClusterPBX™ VoIP enterprise system, designed for resellers and enterprise providers, is a complete multi-tenant, load-balanced and failover-enabled IP-PBX system. ClusterPBX™ accommodates advancing businesses with scalable phone solutions for business growth. Modulis ClusterPBX™ is the solution you need, whether you are continuing with your existing Asterisk system or migrating from a proprietary phone system.