carrier-grade
(2)
REVE Systems
For more than two decades, a company born in Dhaka has quietly wired the plumbing behind millions of internet phone calls - one softswitch, one dialer, one SMS gateway at a time.
OpenClovis
OpenClovis is a Petaluma, California infrastructure-software company that builds SAFplus, a carrier-grade high-availability middleware platform for telecom, networking, and defense equipment. Its libraries, GUI tools, and code generators let engineers design multi-node clustered applications with sub-second fault detection and failover, targeting the 99.999% (five-nines) uptime demanded by network operators. Founded in 2002 and offered under a dual open-source (GPL) and commercial license, SAFplus has been used in deployments by companies including Sonus, HP, Ericsson, NASA, and Lockheed Martin.