http://www.conexant.com/customer/md_winxpinfo.html#q3
這邊有寫這個問題 茲列舉如下---
Windows XP FAQs
Q:After upgrading to Windows XP, my modem does not support speakerphone operation any more.
A:The modem drivers that are available on the XP distribution CD support Data/Fax operation only. You must contact your modem or PC manufacturer to obtain the full XP drivers for your particular hardware, a link to the many manufacturers sites are provided on this site.
宏碁網站
放的只有98/95 看來是沒有辦法了 先這樣吧
謝謝小梅姐