Hi Yang,
2010/9/6 Yang Gu <yang.gu(a)intel.com>:
It's still not clear how ss and ussd interfere with each other.
Current
decision is each ss (call-barring, call-forwarding, etc.) has
interference with ussd, but there is no interference within these ss.
That is, call-barring has interference with ussd, but call-barring has
no interference with call-forwarding.
There is only one signaling channel for the supplementary services.
Only one supplementary service operation can be active at a time. (Or
two, network can initiate ussd notify or request while
mobile-originated ussd is pending.)
--
Pekka.Pessi mail at
nokia.com