Many observers reject the idea of polarizing Intranet telephony between bad, old circuit switching and good, new packet routing.
很多观察家摒弃了在坏的、老的电路交换和好的、新的包路由之间极化内部网电话的想法。
2
In mobile telephony, 2.5G protocols extend 2G systems to provide additional features such as packet-switched connection (GPRS) and enhanced data rates (HSCSD, EDGE).