Classic PhoneTools
This 6 combines phone, speaker phone, fax, answering machine, and voicemail software all on your PC.
CallStation
This answering machine includes a message indicator so you can play back messages from the call log.
3CX Phone System - Free Edition
3CX Phone System is an IP based PBX system that can completely replace a proprietary hardware PBX.
Aptus On Hold
This enables you to play music and voice messages to your callers while they are waiting on hold.
IVM Telephone Answering Attendant
This is a telephone answering machine, voice mail, call attendant and interactive voice response (ivr) program for your PC.