Try the Dialogic® IP Media Server Software: Download a copy here
The Dialogic IP Media Server supports industry-standard APIs, such as VoiceXML and CCXML, for rapid development. Download a copy and obtain a 60 day trial license for use in voice and video IP services.
Try Dialogic SIGTRAN Signaling Software: Download a copy here
Dialogic SIGTRAN software enables SS7 signaling to be transported over IP networks. This host based software stack supports M3UA and SUA. Download a copy of the SDK with a trial license.
Contact Dialogic Sales about Trial equipment and Development Platforms: Dialogic Sales