If your INF file has a [DestinationDirs] section, add the following items to it. Many modem INF files do not have a [DestinationDirs] directory until VoiceView support is added; in that case, you will have to create a [DestinationDirs] section and put all the following items in it.
[DestinationDirs]
Register.Copy = 17 ; INF File Directory
VV_Sys = 11 ; VoiceView System Components
VV_Sock_Sys = 11 ; Windows Sockets System Components
VV_App = 10 ; File Transfer Application
VV_Help = 18 ; File Transfer Help