Section: 5.2.1.9 Traffic channel assignment at mobile originating call establishment
Content: The mobile station supporting multicall includes the Stream Identifier (SI) in the SETUP message. The multicall supporting network shall interprets the SI value as follows: a) Mobile station generates a new SI value at the initiation of an originating call, then a new traffic channel shall be assigned to the mobile originating call. b) Mobile station indicates an existing SI value, then the indicated traffic channel shall be used for the mobile originating call. Mobile station supporting multicall shall never send an additional SETUP with indication that a new traffic channel is requested to a network that does not support multicall. It is a network dependent decision when to initiate the assignment of an appropriate traffic channel during the mobile originating call establishment phase. Initiation of a suitable RR procedure to assign an appropriate traffic channel does neither change the state of a call control entity nor affect any call control timer. NOTE: During certain phases of such an RR procedure, transmission of CC and MM messages may be suspended, see 3GPP TS 44.018[ None ]  [84], clause 3 and 3GPP TS 48.008[ None ]  [85]. The assignment procedure does not affect any call control timer.