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【正文】 t ab l i s h Be arer +Ch an g e T h ro u g h Co n n ect i o nP rep are Be arer +Ch an g e T h ro u g h Co n n ect i o nCo n t i n u i t yCo n t ex t (C 1 ) A D D . rep l y (T 1 )RA B A SS IG N ME N T RE QRA B A SS IG N ME N T CO MP LB ea rer Es ta bl i s hm en t a nd I u U PI ni ti a l i z a ti o nCo n t ex t (C 1 ) A D D . rep l y (T 2 )Co n t ex t ($ ) A D D . req u es t ($ )Be arer In f o rm at i o nCo n t ex t (C 1 ) A D D . req u es t ($ )In i t i al A d d res sCA L L P RO CE E D IN GSE T U PUE RN C/ BS C MSC S MG W2351U P In i tU P In i t A ck前向承載建立時序（一） Co n t ex t (C1 ) MO D . rep l y (T 2 )Co n t ex t (C1 ) MO D . req u es t (T 2 )Co n t ex t (C1 ) MO D . rep l y (T 1 )Co n t ex t (C1 ) MO D . req u es t (T 1 )6CO N N E CTA L E RT IN GA n s w e rA d d res s Co m p l et eUE RN C/ BSC MSCS M G WCh an g e T h ro u g h Co n n ect i o n +A ct i v at e In t erW o rk i n g Fu n ct i o n(w h en ap p l i cab l e) +A ct i v at e V o i ce P ro ces s i n gFu n ct i o n (w h en ap p l i cab l e)A ct i v at e In t erW o rk i n gFu n ct i o n (w h en ap p l i cab l e) +A ct i v at e V o i ce P ro ces s i n gFu n ct i o n (w h en ap p l i cab l e))前向承載建立時序（二） 5。基本語音呼叫業(yè)務(wù)流程 前向承載建立時序（二） 13UER N C / BSCMSC S M G W bG MSC S M G W aCo n t ex t (C1 ) A D D . req u es t ( T 1)Co n t ex t (C1 ) A D D . rep l y (T 1 )A SSIG N ME N T RE Q U E STA SSIG N ME N T CO MP LRes erv e Ci rcu i t +C h a n g e T h ro u g h Co n n ect i o nG SM:Co n t ex t (C1 ) MO D . req u es t ( T 2 )Co n t ex t (C1 ) MO D . rep l y (T 2 )Co n t ex t (C1 ) A D D . req u es t ( $)Co n t ex t (C1 ) A D D . rep l y (T 1 )RA B A SSIG N ME N T RE QRA B A SSIG N ME N T CO MP LBe a r e rEs ta bl i s h.a nd I u U PI ni ti a l i z a .A d d res s Co m p l et eA L E RT IN GA d d res s Co m p l et e Co n t ex t (C1 ) MO D . req u es t ( T 2 )Co n t ex t (C1 ) MO D . rep l y (T 2 )CO N N E CTA n s w e rCo n t ex t (C1 ) MO D . req u es t ( T 1 )Co n t ex t (C1 ) MO D . rep l y (T 1 )91112P rep are Bearer +Ch an g e T h ro u g h Co n n ect i o nSen d T o n e (s t art p ro v i d i n g ari n g i n g t o n e f o r a s p eech cal l )U MT S:10Ch an g e T h ro u g h Co n n ect i o n + A ct i v at eIn t er W o rk i n g Fu n ct i o n (w h enap p l i cab l e) + A ct i v at e V o i ce P ro ces s i n gFu n ct i o n (w h en ap p l i cab l e)St o p T o n e (s t o p p ro v i d i n g a ri n g i n g t o n ef o r s p eech cal l ) + A ct i v at e In t erw o rk i n gFu n ct i o n (w h en ap p l i cab l e) + A ct i v at eV o i ce P ro ces s i n g Fu n ct i o n (w h enap p l i cab l e)A n s w e rCo n t ex t (C2 ) MO D . req u es t ( T 4 )Co n t ex t (C2 ) MO D . rep l y (T 4 )A ct i v at e V o i ce P ro ces s i n g Fu n ct i o n(w
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