From v3.7, the secondary license of Brekeke PBX is just a half price of the primary license. No more minimum fee required.
For example, if you have the smallest user set for Brekeke PBX, 20 users, the cost of adding secondary license is only $280 USD.
Of course, you can purchase secondary license for your existing Brekeke PBX system!
Learn more about Brekeke PBX’s redundancy feature here: