Thanks for replay, I have received Unbolock event now, as we configure PABX for ISDN protocol, Then it is fine now.The log as below: 05/06 11:53:23.047 [GC_APICALL]: gc_OpenEx(devicename=:N_dtiB1T1:P_DM3:V_dxxxB1C1, mode=EV_SYNC) Success 05/06 11:53:23.047 [MISC]: gc_SetCallingNum(linedev=4, phone_num = 1001) Success 05/06 11:53:23.147 [MISC]: ********* Received a GC event ********* 05/06 11:53:23.147 [EVENT]: GCEV_UNBLOCKED 05/06 11:53:23.147 [STATE]: GCST_NULL is the current GC call state In addition,I want send UU IE message, i use gc_SetInfoElem before make call, The telephone is is ringing, but no text message on telephone, The code as below: gc_OpenEx(......); InitIEBlk(&ieBlk); if (gc_SetInfoElem(pline- ldev, &gcIeBlk) == -1) { ///} gc_MakeCall(pline- ldev, &pline- call[callindex].crn,.....) Thanks Frank
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