Hardware Requirements
Hardware requirements for VoIP origination are simple. The only hardware needed is a gateway that takes calls off the Internet and delivers them onto PSTN lines. A gateway therefore has two types of Interfaces.
1. An Ethernet interface that connects the gateway to the Internet.
2. One or more telephony interfaces taking analog or digital phone lines.
An analog line can take one phone call at a time while a digital line can take more. A T1 lines takes 24 calls and supports 1.5 Mbits while an E1 lines takes 30 calls and supports 2Mbits simultaneously. A typical digital gateway has 4 T1s or 4 E1s
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