sipXecs is described as 'A SIP based implementation of a PBX / unified communications system' and is an app in the Social & Communications category. There are more than 10 alternatives to sipXecs for a variety of platforms, including Linux, Windows, Mac, Android and iPhone. The best alternative is Asterisk, which is both free and Open Source. Other great apps like sipXecs are 3CX Phone System (Freemium), FreeSWITCH (Free, Open Source), Wazo (Free, Open Source) and Kamailio (Free, Open Source).
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media. It was created in 2006 to fill the void left by proprietary commercial solutions.
You will be able to setup your own VOIP system in ONE HOUR. miniSIPServer can run on Windows, Linux and even Raspberry Pi. We can also run it on kinds of virtual machine systems, such as Hyper-V, VMWare, KVM, Xen.
sipXcom provides complete enterprise-grade telephony, unified messaging, Instant messaging, audio conferencing, and many other features. sipXcom can be run along side your existing Cisco, Avaya, Mitel, Shortel or other PBX while you migrate users to the sipXcom system.