被叫上发connect之后，主叫切换到另外一个BSC的小区，随之主叫接通 ，接通之后出现类似单通的现象，主叫始终只能听见被叫的振铃声（测试手机未开启彩铃），被叫则在接通之后听不见任何声音。检查两个BSC的A口占用没有发现异常，检查两个基站的话务报告和上、下行干扰情况没有发现异常。

可能这个问题比较棘手，工作好几年了确实还没有碰到此类情况，恳请各位大侠帮忙查处一下，谢谢啦！下面是主被叫的信令，均是正常的：
主叫信令：
17:48:19.09MS1 RR Measurement Report
17:48:19.53MS1 RR System Information Type 5ter
17:48:19.57MS1 RR Measurement Report
17:48:19.60MS1 CC Alerting
17:48:19.60MS1 Call Setup
17:48:19.71MS1 RR Synch Channel Information
17:48:20.01MS1 RR System Information Type 6
17:48:20.07MS1 RR Measurement Report
17:48:20.50MS1 RR System Information Type 5
17:48:20.54MS1 RR Measurement Report
17:48:20.96MS1 RR System Information Type 5ter
17:48:21.01MS1 RR Measurement Report
17:48:21.39MS1 RR Synch Channel Information
17:48:21.45MS1 RR System Information Type 6
17:48:21.50MS1 RR Measurement Report
17:48:21.51MS1 RR Synch Channel Information
17:48:21.93MS1 RR System Information Type 5
17:48:21.98MS1 RR Measurement Report
17:48:22.40MS1 RR System Information Type 5ter
17:48:22.48MS1 RR Measurement Report
17:48:23.07MS1 RR System Information Type 6
17:48:23.07MS1 RR Handover Command
17:48:23.09MS1 RR Measurement Report
17:48:23.09MS1 RR Handover Access
17:48:23.10MS1 RR Handover Complete
17:48:23.10MS1 Handover
17:48:23.43MS1 CC Connect
17:48:23.43MS1 Call Established
17:48:23.45MS1 CC Connect Acknowledge
17:48:23.65MS1 RR System Information Type 5
17:48:23.70MS1 RR Measurement Report
被叫信令：
17:48:19.04MS2 RR Assignment Command
17:48:19.09MS2 RR Assignment Complete
17:48:19.20MS2 CC Alerting
17:48:19.20MS2 Call Setup
17:48:19.71MS2 RR System Information Type 5
17:48:19.76MS2 RR Measurement Report
17:48:20.20MS2 RR System Information Type 5ter
17:48:20.23MS2 RR Measurement Report
17:48:20.67MS2 RR System Information Type 6
17:48:20.71MS2 RR Measurement Report
17:48:21.15MS2 RR System Information Type 5
17:48:21.20MS2 RR Measurement Report
17:48:21.64MS2 RR System Information Type 5ter
17:48:21.68MS2 RR Measurement Report
17:48:21.81MS2 RR Synch Channel Information
17:48:21.93MS2 RR Synch Channel Information
17:48:22.10MS2 RR System Information Type 6
17:48:22.15MS2 RR Measurement Report
17:48:22.59MS2 RR System Information Type 5
17:48:22.64MS2 RR Measurement Report
17:48:23.07MS2 RR Synch Channel Information
17:48:23.07MS2 CC Connect
17:48:23.09MS2 RR Synch Channel Information
17:48:23.10MS2 CC Connect Acknowledge
17:48:23.10MS2 Call Established
17:48:23.12MS2 RR System Information Type 5ter
17:48:23.12MS2 RR Measurement Report