Step-by-Step Instructions
To configure Microsoft NetMeeting to work with the VoIP gateway, use this procedure:
Open Microsoft NetMeeting and choose Tools > Options.
Click the General tab and enter your First name, Last name, and E-mail address.
On the Audio tab, click Advanced.
Check Manually configure compression settings and select CCITT u-Law, 8.000kHz, 8 Bit, Mono from the Preferred codec for audio compression drop-down list. Click OK on both dialog boxes.
From the NetMeeting Tools menu, choose Options > General > Advance calling.
In the Gateway settings area, check Use a gateway to call telephones and videoconferencing systems and enter Gateway IP Adress in the Gateway field.
This URL should Helps You:
http://www.cisco.com/warp/public/788/voip/netmeeting-ios.html