Free calls check - enum ?

[shezad]

Hi, i have never figured out how enum works.

Just wondering if this is possible, A friend of mine is connected to a voip company that allows sip calls (sip.telio.no), works fine with sipbroker also. In my voxalot account i have a dial plan that makes all calls to norway through voipbuster. I can manuelly put his number as a equal in dial plan and it would then dial fine to him without using my voipbuster free minutes. Is there a way that when i dial a number it first check if this call could go for free to telio instead of going through voipbuster ?

If yes, how ?