Voicent Gateway cannot detect a voice capable modem

!!! If your computer does not have a voice modem, you will see the Failed to detect a voice modem dialog window. Voicent software cannot continue without a voice modem.

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I have a Voicent voice modem, but the gateway still failed to detect a voice modem
My problem is not listed here

Notes:

  1. What is a voice modem?

  2. How do I check what kind of modem my computer has?