/// <summary>
/// 保持呼叫
/// </summary>
public void HoldCall()
{
var errno = PlcmProxy.HoldCall(this.CallHandle);
if (ErrorNumber.OK != errno)
{
throw new Exception("保持呼叫失败，ErrorNo=" + errno);
}
log.Info(string.Format("呼叫{0}保持", CallName));
}