The cost advantage of using packet communications is so great that an entire industry has formed to translate circuitbased voice into packet voice, routing the transformed voice over the packet network and then converting it back into circuit-based voice.

• 利用包通信的价格优势如此巨大，以至整个业界已经组织起来，把基于电路的语音转变成包语音，再把转换过的语音在包网络上通过路由传输，然后再转换成基于电路的语音。