I also had some problems to get it running. It's really weird...
The original KONFTEL version, of course, need a 3rd-party IP Endpoint license. And it is a SIP phone, hence you will create a SIP extension.
The AVAYA labled B179 needs an AVAYA IP Endpoint license. It is still a SIP phone, so you need to create a SIP extension, even if you do not have any license for 'other' SIP phones. (similar to the video softphone, but here you have to create the extension yourselfs)
The next question is:
How can you use standard IPO features like inquiry, transfer, conference using IPO ressources, etc. ?
A conference call can only include 4 parties. They are called directly, not using the IPO conference features.