sipXecs open source unified communications and collaboration project. If you are looking to replace your aging (IP) PBX with an all software modern communications solution that scales to mid-size and large enterprise and can be deployed in the cloud, look no further.  A fast growing list of large enterprise use our solution as an alternative to expensive systems from vendors such as Avaya, Cisco, and Microsoft.  If you are an organization with many hundred or even thousands of branch offices distributed geographically, we can help centralize your communcations infrastrucutre into a data center with geographic redundancy, seamless failover, and a robust and easy to manage system that scales to your needs.