I've been using FOP2 with Asterisk for years now and I had the same question when I started, but these guys didn't have the answer, so I figured it out myself.
I might have a solution that can help, but I need to know what platform do you use (freepbx, freeswitch, asterisk etc.), the sooner you tell me that, the sooner I can share the solution.
I'm sure your query will rot in this forum because Asternic's support team is too busy enjoying their vacation, many are still working from home in this situation to support their customers, but not Asternic, they just want you to Pay, Pay, Pay and give you buggy applications and lousy support till you get frustrated and switch to "iSymphony".
I test many client servers for Asterisk and Fop2 functionality, the
license I have is used to just test full functionality
of fop2 and once testing is done I revoke the license using
"/usr/local/fop2/fop2_server --revoke" command, but off-lately I
haven't been able to revoke them using the command at all, I keep
getting the error on every machine "Serial code not available for
revocation on this machine!".
I requested you guys to revoke the license manually and after that was
done, the server that had the license linked to kept showing "Valid
License (/usr/local/fop2/fop2.lic)" upon executing
"*/usr/local/fop2/fop2_server --test" *command, however I was able to
register the license with another server, and now the license can't be
revoked from that one too, there seems to be some major issue with FOP2
functionality after perhaps a recent upgrade...
