[单选] Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）

以发起方式设立公司，可以采用公募发行方式发行股票 任何职业道德都具有强烈的纪律性。 简述商业银行常用的贷款定价方法及其内容。 Yours truly， have been called upon to add location-based services into an existing controller-based wireless design which primarily encompasses handheld devices such as barcode scannersand cisco 7920 wireless ip phones. In which mode should you deploy the additional access points to achieve the density required without excessive co-channel interference？（） tracking mode。 monitor mode。 location mode。 sniffer mode。 有机绝缘材料制成的断路器拉杆常因受潮而降低绝缘性能，当沿面由于（）附着而脏污以及存在贯穿性的（）等缺陷，也会严重也使拉杆绝缘强度降低。 Which IP telephony component provides call processing, such as signaling, that in a traditional voice network is provided by switching equipment, such as a PBX?（）