Could not connect with NetMeeting

Hi Experts,
I am using Windows XP Professional in the office. There are instances that we are using NetMeeting, however, I cannot connect to everyone I have tried to call as well as those who are calling me. I am getting an error that says. “User is unable to accept NetMeeting calls. ”
Here are the things I checked so far:
- The person I am trying to call or the person calling me has internet connection
- I do have internet connection
- The person who tries to call me has his NetMeeting working
After checking those, I found out that the problem is really the NetMeeting in my computer office. I know I should have contacted our Administrator about this, but I just want to know if I can fix the issue using my login. There is really no hurry, since we are using NetMeeting not often. Kindly advise what needs to be done.
Thanks in advance.
