![]() Enhanced DTM must be enabled if you do not want to abort the PS session when an attempt to establish a simultaneous CS voice call is made. The operating mode must be set to Cell Off in order to change the state of Enhanced DTM. DTM must be enabled in the test set in order to have simultaneous circuit switched voice and packet switched data connection. The operating mode must be set to Cell Off in order to change the state of DTM. Parameters selected for channel assignment ![]() The table below shows the various connection transitions and how these transitions affect the DTM trigger status and the parameters selected for channel assignment. The deferred DTM parameters are used instead when the handover occurs during a DTM session. This also holds true for some TCH and PDTCH Handover Setup parameters. The related PDTCH parameters revert after the DTM session has been released. The Immediate DTM parameters are used when an attempt to establish DTM occurs and after DTM is triggered. Some of the DTM parameters have two styles: Immediate and Deferred.
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