SIP - Know How on VoIP

Easy 'Know How'

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What is a SIP trunk?
A SIP trunk is a way to get external calls in and out of an IP PBX. All extensions and accounts are internal, at some point someone will want to talk to other telephone users outside the PBX. This is done by using a trunk from the PBX to the telephone network.


What is the PSTN?
The PSTN is the Public Switch Telephone Network, a term for the telephone network as we have used for many years.


What is a Media Gateway?
A media gateway is a device that sits between the PBX and the PSTN network. pbxnsip communicates with the media gateway using a Trunk.


What is NAT?
Network Address translation (NAT) is the translation of an Internet Protocol address (IP address) between networks. One network is designated the inside network and the other is the outside. Typically, a company maps its local inside network address to a global outside (public) IP addresses. NAT unmaps the global IP addresses on incoming packets back into local IP addresses. This helps ensure security. It can also cause severe headaches without a NAT filter or session border controller.

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