OpenXg Inc. is a Seinajoki, Finland based company specializing in telecommunications applications for telco's, ISPs and enterprises. Its main product is general purpose OpenSIPg SIP Platform that can be used to provide SIP based telecommunication services to end users and enterprises. Another related product is OpenSIPg Trunk Proxy that is designed to serve as telco's core SIP proxy.
You can download OpenSIPg SIP Platform datasheet here and OpenSIPg Trunk Proxy datasheet here. Please contact the email address given on the datasheets for more information.