You could have downloaded X-Pro-Vonage 2.0 for Mac from our software library for free. This software for Mac OS X is an intellectual property of Vonage, Inc. The application lies within Internet & Network Tools, more precisely General.
From the developer:
X-Pro-Vonage is a VoIP software solution that offers the freedom and convenience of making and receiving calls from your Mac using the Vonage service. More information about the SoftPhone service is available.
You may want to check out more Mac applications, such as Filedart, which might be similar to X-Pro-Vonage.
E-mail Tools
Device Assistants