Usually in broadband modem or fiber/Ethernet connection there is a house behind the voice gateway, except for each of the voice channel to provide support for voice processing functions, the gateway must also provide all kinds of WAN to LAN data routing functions, including quality of service (QoS) mechanisms, firewall protection, network address translation (NAT), optional wireless LAN connection, certification and voice security and quality of experience (QoE) that appeared on the market recently, each of these functions in maintaining and protecting the voice connection and quality plays an important role, not correct to meet these requirements will directly led to the decrease of the perceived speech quality,
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