Leaving the call hanging can lead to billing issues because the application is unable to process incoming call hang-ups when it is stuck waiting for a response message.
保持调用挂起可能会导致收费问题，因为当应用程序受阻塞、等待响应消息时，不能处理入站调用挂起。
Under this condition, the MT short message shall be sent from the SMSC local to the paying party, and the billing center local to the paying party shall complete the authentication operations.
这种情况下，该MT短消息应该从付费方归属地的短消息中心发送，并且由付费方归属地的计费中心完成鉴权操作。
The Internet-based mobile short-message service also needs the high quality billing system to support the providing of the high quality service.
移动短消息联网业务有较大的数据量和复杂的业务处理，要求有高质量的计费系统来支撑高质量的业务服务提供。
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