...防范各种DDoS攻击，保护PS域网元；过滤异常GTP报文（包括GTP-in-GTP）；防止基于GTP隧道状态的攻击；防止超额计费（Overbilling）；阻止非法接入；支持GTPv0、GTPv1和GTP’；支持路由和透明模式，实现灵活组网；支持GTP隧道的双机热备。
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Work-Report Formats and Overbilling 工作报告格式与过度收费
以上来源于: WordNet
Federal investigators have uncovered many examples of corruption, waste, overbilling and bad workmanship.
NPR: Rebuilding Iraq: A Contract Goes Awry
And even some of these have been suspected of overbilling their federal paymasters.
ECONOMIST: For-profit medicine
Most recently, Rep. Henry Waxman, a California Democrat, accused the company of overbilling the government for fuel it imports into Iraq.
CNN: Halliburton asks employees to help defend company
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