Hi Yang,

2010/9/6 Yang Gu <[email protected]>:
> 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
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