I found this page:
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I need a simple survey module with which callers can enter numbers like 1, 2, 3 for satisfaction survey after a call, and can work with other FreePBX modules (such as IVR). It appears you have implemented such a module. I wonder if you can make it a "commercial" module which people can purchase? Most commercial modules I saw range from $20 to $60. I'm wondering if you can sell me your module in a similar way, say, for $50. There should be no additional work involved, though at least I need documentation and be able to install on my FreePBX. Please let me know. Thanks!