ZyXEL Communications X6004 User Manual page 245

On the Service tab, enter your Click-To-Talk License Key then click Update. The
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X6004 checks to confirm it is valid. As soon as it completes this check, the Click-
To-Talk Quantity updates, indicating the number of CTT accounts your license
grants you.
You can check or update your license account at any time by logging into
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myzyxel.com.
Note: Although you can embed as many of the web-based clients as you want in your
web pages, the maximum number of unique numbers they can call is based on
the number of clients allowed by your license.
X6004 User's Guide
Chapter 16 Click-To-Talk Group
245