Although it’s not listed on the website, we do offer a special Commercial Unlimited edition license to be used only for preproduction / testing environments. This license includes all functionality of the CU edition, but is limited to 5 simultaneous calls. This license is 1/2 the price of the regular CU edition, and optional maintenance agreement (for updates) is also 1/2 price. Please contact support@telium.io with your current customer number to purchase this license. (This version is only available to customers with at least 1 CU license).
If your customer wants to run a high volume of calls over the testing system then they would have to buy a full CU license. We don’t distinguish between testing and production systems if both need full features and full call volume. (We also have to prevent license fraud – so a full license has to be full price).