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Microsoft KB Archive/254148

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Knowledge Base

Older Voice Modems with Phone Dialer Cannot Have Modem and Handset Simultaneously off the Hook

Article ID: 254148

Article Last Modified on 3/1/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition

This article was previously published under Q254148


Older voice modems with a phone dialer, such as the Cirrus Logic 14.4/Voice modem without a speaker phone, cannot have the modem and the handset off the hook at the same time.


This condition exists because of hardware design limitations of these older voice modems.


On these modems, TAPI 3.0 cannot answer audio calls on the voice modem. In TAPI 2.0, voice modem calls to lineOpen (owner, interactivevoice+automatedvoice) do not work; in TAPI 3.0, those same modem calls to RegisterCallNotifications (owner, audio) also are unsuccessful. This prevents the TAPI 3.0 program from receiving incoming audio calls on these modems. However, TAPI 3.0 can answer incoming data calls and make outgoing audio calls over these modems.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Additional query words: win2krelnotes

Keywords: kbprb KB254148