ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

QSIG Path Replace TransferThe Path Replacement Transfer is a method of transferring calls inQSIG ISDN.The Path Replacement Transfer occurs in the following manner:1 The Omvia Media Server receives an inbound call and answers.For more onISDN_QSIG_HOLD, seepage 5-14.For more on ISDN_QSIG_STARTXFER, seepage 5-16.2 When the caller requests a transfer the application places theinbound caller on hold using the ISDNTKIT toolkit functionISDN_QSIG_HOLD.3 The application places an outbound call using connect.dll andgetSecondLineAndDial.4 After the call is placed and a good result code is obtained fromgetSecondLineAndDial, the application waits for the outbound callto answer or fail by checking the result of GetStatus.For more information onconnect.dll and itsassociated functions, seethe Call Transfer OptionsAdministrator’s andDeveloper’s Guide.5 If the call is answered, the application places another ISDNTKITtoolkit call, ISDN_QSIG_STARTXFER, then enters sleep mode.6 The application waits for the switch to release the lines and makethe transfer. If the transfer is completed, the switch sends adisconnect message for both the inbound and outbound lines andthe application jumps to ASYNC processing and terminates thecall.7 The application uses the ReleaseSecondary function formconnect.dll in the ASYNC leg to ensure that the resource for theoutbound line is released.8 If the outbound call fails (with a status of RING NO ANSWER,BUSY, etc), the application does not make the ISDN toolkit call tostart the transfer.For more information onISDN_QSIG_HOLD_RETURN, see page 5-15.9 It removes the caller from remote hold with the ISDNTKIT toolkitcall ISDN_QSIG_HOLD_RETURN, and calls the ReleaseSecondaryfunction.10 At this point the transfer has failed and the application handles thefailure.11 If the outbound call is answered and the toolkit functionISDN_QSIG_STARTXFER is called, the application waits in sleepmode for the disconnect from the switch.5-12 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition