ThePhoneBOT 

Turn your PC into a powerful, multi-line telephone answering machine! Remote Clients for IP call screening, Unique caller greetings. pics & rings for callers. voicemail over the internet. Call log. Email / text message on new call. Trillian plugin.
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PC 2 Answering Machine - Professional Edition 

'PC 2 Answering Machine 2.0 - Professional Edition' is a software designed for the personal computer which functions as an answering machine for home or office. Just connect your phone line, and turn your PC to a powerful Answering Machine.
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