Free - Vidosystem

Easy to use Free SIP Softphone for voip providers and customized softphone for voip providers
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$19.50 - NCH Software

IVM is a telephone answering machine, voice mail, phone attendant and interactive voice response (ivr) program for Windows computers with voice modems or professional telephony line devices.
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$499.00 - PBXPress Communications, Inc.

PBXpress is a voice over IP (VoIP) replacement of traditional PBX in the era of the Internet. All of your phones are connected and provisioned via an IP network, your phone calls are always recorded and connected at a fraction of the usual cost.
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Free - Voicent Communications, Inc

Easy to use automatic telephone notification software with confirmation and built in calendar. Ideal for time sensitive customer based organizations and professional offices. The reminder messages can be personalized with text to speech feature.
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