Sysmaser WORKS very good, make sure you commit your Sales representative to deliver the equipment with the configuration you request and that you will get support on the installation of your equipment and configuration of your application, there are some skillfull technicians there, like Delyan Radichkov.
If you need to see applications and people posting about they’re applications, please visit http://www.g729.com you will see many people receiving response on what to do next or how to troubleshoot.