The total current capacity of the maximiser 5 Series system is 10,000 extensions and 200 Call Servers. Each 5100 Call Server module handles up to 500 extensions be they analogue, IP or any mix of the two. If your requirement is for more than 500 extensions simply add more Call Servers. This approach allows systems to grow in an organic manner without the need to upgrade or replace processors and cabinets as is the case with traditional PBXs. Yet no matter how big or small your system may be, or how many sites it's spread across, it still appears to your employees as one single entity - and what's more it's managed as a single system, allowing you to significantly reduce management costs.

For requirements over 10,000 extensions, maximiser XS supports up to 100,000 users. Utilising the existing 5 Series maximiser application suite running on Apple’s high-reliability XServe Unix platform, the XS Call Server offers all of the familiar maximiser architectural trademarks – distributed processing, cost-effective scalability, equal support for IP and analogue phones, independence from the underlying LAN infrastructure. It also allows multiple Virtual maximiser Call Servers to run on a single XServe platform, with each Virtual Call Server being capable of running a different level of software if required. This makes maximiser XS perfectly suited for running Managed, Hosted and Multi-Tenancy IP Telephony applications in addition to meeting large scale Enterprise requirements. maximiser XS utilies the existing 5 Series modules to provide connectivity for analogue telephones, ISDN & DPNSS trunks and media relaying for IP trunks.