Downloading C4Call 5.1.3 from our website was free. The latest version of the software can be installed on PCs running Windows XP/Vista/7/8, 32-bit. The C4Call installer is commonly called C4Call.exe, _DA42371E4F4A4396025281.exe, _D90890EF69BA1CAC206FD1.exe, Uninstal.exe or PC2Phone.exe etc. C4Call relates to Communication Tools. This free program was originally produced by C4Call. The most popular versions of the program are 5.1, 4.0 and 4.
From the developer:
C4Call is a free PC dialer that enables you to stay in touch with your friends and family directly from your desktop computer. You can make cheap international calls, add contacts to your address book, edit and delete contacts, send and receive messages.
You may want to check out more software, such as DigiDelivery, PhoneTray Free or eChat, which might be related to C4Call.