I have not checked in on Net2Max in a while....and I may not have time to check in the next little while. That said life has gotten much easier with Skype...where you may not even need Net2Max.
To receive SIP Calls in Skype simply use the following SIP URI format (no setup required):
*883975*
SkypeUser@sipbroker.com
So let's say your Skype Username was fuzzuy...then you would use this SIP URI:
*883975*
fuzzuy@sipbroker.com (all possible thanks to
SipCode Brasil - Home)
Now you can't really call *883975*
fuzzuy from a SipBroker access number (the username has letters which you can't dial). But you can set yourself up with a SipBroker Alias .... or better yet get yourself an INum number and point it to that SIP URI above.
Hope that helps
PS. INum numbers can now be called for free from Skype and GoogleVoice.