5.1 General
22.0793GPPService definitionStage 1Support of Optimal Routeing (SOR)TS
SOR shall be provided for all circuit switched Telecommunication Services, except emergency calls, Dedicated PAD and Dedicated Packet Access (GPRS is for further study).
The network feature shall be applied automatically for all calls except for those calls for which the HPLMN of the called party denies the optimal routing.