trixbox CE is the most flexible PBX system available today. If you or your client needs a highly customized solution and the trixbox Pro hybrid-hosted architecture is unfitting, use trixbox CE. Not only does trixbox CE allow you to build your own custom features and modules, but you can rely upon the community to help as well. The trixbox community is one of the largest and most active communities of trixbox and Asterisk users in the world. The members of this community work every day to help each other answer questions, resolve issues, fix bugs, make enhancements, and develop projects. trixbox CE has all the benefits of open source plus a commercial company standing behind it.