Fail to use Netmeeting with shoutcast

[saraku]

I have been trying to have 2 ppl talking together in the shoutcast

the problem like this.

1st trial (in sequence)
__________
1. Start shoutcast
2. connect to network
3. startup netmeeting to connect to my friend's IP
4. I can hear my friend's voice, my friend cannot hear my voice
5. shoutcast can output both voice

2nd trail (in sequence)
__________
1. Startup netmeeting
2. I can hear my friend's voice as well as my friend can hear me
3. I start up shoutcast
4. I connect shoutcast to network
5. Shoutcast cannot detect any sound input (even if we keep on talking), and keep on disconnecting every 30sec , but both sounds can output to listener

THe suggestion is that the sound card is being occupied either with shoutcast or netmeeting, while both cannot use together..
either card is used for shoutcast, so cannot deliver my voice to my partner, or card is used for netmeeting, cannot deliver sound information to shoutcast

Am i rite? pls give me suggestion

[saraku]

Anyone can help me to test pls...pls..pls..