What does the Thunderbitd integration add-on do?
The Thinderbird addon will let you dial your contacts directly from your Thunderbird addressbook.
The Thunderbird add-on is a BIZ feature. It is not available for Zoiper Free.
Supported operating systems:
The Thunderbird Addon is available for Linux, Mac and Windows
More information about the Thunderbird Addon on Windows
More information about the Thunderbird Addon on Mac OS X
More information about the Thunderbird Addon on Linux