offsite notifcation does not require another license... I would turn on more logging to get to the bottom of the issue:
1. go to ip_address/sec_cont/ops/cfglog.htm
2. Under Event Log filter, click All, Output to Disk, New Omcponent message filter, click on all
and in the Customer settings put in -1
3. scroll down to nbxInetNot0 and select that
4. at bottom of page, click on Apply
5. Now make a test call to leave the offsite notifation
6. go to your NBossLog.txt and see what you have in there..
Hope this helps.. please post results here... if this does not work, I would suggest opening a case with 3com.