The best way to contact Customer Support is to...
  Open A Case

You can also reach Technical Support by Phone...
  Toll Free United States: 888-357-7667
  International: +011 978-614-4000
  Lookup International Toll Free Phone Numbers
  Phone support hours are 8am- 8pm (EST)

When you contact Customer Support, the following information is helpful in diagnosing and solving problems:

• Type of network platform
• Software and firmware versions
• Probe model number
• License number and your organization's name
• The text of any error messages
• Supporting screen images, logs, and error files, as appropriate
• A detailed description of the problem

Sales
Call 800-357-7666 for the sales office nearest your location.

Training
  http://www.netscout.com/training

User Forum
  http://www.netscoutuserforum.com/

Additional Contact Info
  http://www.netscout.com/company/contactus.asp