hello:
你再换其他的版本试试。 你的通话挂断的原因说这个, this is casue definition:
===================
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.
====================
另外,你再检查检查运营商那里,确认他们的服务没有问题。