Due to its large market share, Portugal Telecom is still considered a de-facto monopoly in fixed telephony in Portugal.
由于其占据大量的市场份额，葡萄牙电信仍旧被认为是葡萄牙固定电话市场中的实际垄断公司。
The Session Initiation Protocol (SIP) is generally seen as the de-facto protocol to tap into the world of telecom.
会话发起协议（Session Initiation Protocol，SIP）通常被视为与电信领域建立联系的事实协议。
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