PC-Telephone is a Social & Communication software developed by PC-Telephone.com. After our trial and test, the software is proved to be official, secure and free. Here is the official description for PC-Telephone:

MarydownEditor: It is a powerful communications software application that enables you to exploit the full communications potential of the Internet and public telephone networks ISDN/PSTN.

PC-Telephone turns your computer into Internet telephone, ISDN telephone, Fax Machine, answer phone, voicemail, File Transfer.

Features:

Telephony
All normal full-duplex telephone operations ?enables you to place and receive phone/fax calls PC-to-PC, PC-to-Phone/Fax and Phone/Fax-to-PC. You can make phone calls using your PC sound card or USB telephone device.
Calling Line Identity Presentation/Restriction (CLIP/CLIR) ?displays the caller's number when the phone rings (caller ID).
Call Answer ?Answers automatically incoming calls after a specified delay.
Call Scheduling ?dials automatically phone/fax numbers at a specified time.
Call Forwarding ?forwards automatically incoming calls to a predefined number.
Call Transfer ?transfers an active call to another number.
Call Waiting ?enables you to switch Back and Forth between active connections.
Call HOLD/Muting ?temporarily blocks the remote party from hearing your voice. A playback can be placed on the line instead.
Call Accounting ?logs all successful calls in the Journal. Unanswered calls are logged in the Missed Calls folder.
Audio Conferencing ?ensures simultaneous multi-party telephone conversation.
Full-Duplex Recording ?records telephone conversations.
Encryption ?encrypts telephone calls. This feature is applicable for PC-to-PC phone calls only, regardless of the network used.

Data Transfer
Direct Data Transfer ?sends/receives files using different communications networks.
Scheduled Data Transfer ?sends automatically the selected file at a specified time to a specified number.

Fax Transfer
Direct Fax Transfer ?sends/receives fax documents including analog Group 3 and digital Group 4 faxes to/from PC or regular fax machines.
Scheduled Fax Transfer ?sends automatically the selected fax file.