通過層三的消息，很難看出什么實質性的問題：
查看你的截圖可以看到信號質量都不錯，干擾也不是很大，
通過24008可以看到：
H.1.5 Cause No.16 "normal call clearing"
This cause indicates that the call is being cleared because one of the users involved in the call has requested that the call be cleared.Under normal situations, the source of this cause is not the network.
1.協議原文說基本上是終端側的操作，例如可能誤操作了掛機鍵
2.查找通話流程也沒有你說的符合的項目。但看LOG確實是從終端發(fā)出的，且這個cause原因致都是終端可以自己做的，需要查看底層的一些原語信息才能進一步定位了。
iii. If the network has received an ALERTING message, but does not receive a CONNECT or DISCONNECT message prior to the expiry of timer T301 (or a corresponding internal alerting supervision timing function), then the network shall: initiate clearing procedures towards the calling user with cause #19 "user alerting, no answer"; and initiate clearing procedures towards the called mobile station in accordance with subclause 5.4.4, using cause #102 "recovery on timer expiry" or using cause #31 "normal, unspecified