PC-Telephone is is a standalone software application (SoftPhone) capable to provide telecommunications services such as telephony and file/fax transfer on various communications networks – Internet (IP/SIP), Integrated Services Digital Network (ISDN) and Public Switched Telephone Network (PSTN). It turns the computer into an Internet/VoIP telephone, ISDN telephone, fax machine, voicemail, VoIP switch/PBX and more. Supports free PC-to-PC and cheap PC-to-phone/fax calls over Internet or ISDN/PSTN. PC-Telephone provides high quality voice and seamless integration (call control) with any USB phone device available on the PC. Supported features: caller ID, CLIP/CLIR, audio conferencing, call answer, call transfer, call forwarding, call waiting, call accounting, call recording, etc. Good for call center, companies and private use.