1. The communication between the BSC and the BTS is normal.
2. The BTS is configured with the TRX and supports speech service.
3. One or more MSs are in conversation state.
Result of the remote speech channel loopback: DSP RMTSPCHLOP:; The result is as follows: +++ HUAWEI 2008-02-18 15:43:04 O&M #231 %%DSP RMTSPCHLOP:;%% RETCODE = 0 Execution succeeded TMSI = 4294967295 IMSI = 460190188880047 MSISDN = 13988880048 IMEI = NULL Loopback Location = GEIUA/GOIUA Remote Speech Channel Loopback Direction = MSC (Number of results = 1)