Router with VoIP gateway and LAN ports

Router with VoIP gateway and LAN ports

Routers with VoIP gateways usually have one or four LAN ports. Those with one LAN port require to use a switch for branching the computer network when connecting more computers or other network devices. Devices with four LAN ports, only from the fifth device, require branching in the form of a switch.
Figure: Router with two Internet inputs, four-port switch and two-port VoIP gateway
Legend: WAN socket (type RJ-45) – connection from the Internet LAN socket (type RJ-45) – connection of: computer, local IP network, network devices FXS socket (type RJ-11) – connection of telephone sets Ethernet cable terminated with RJ-45 plugs Flat telephone cable, two or four wires terminated with RJ-11 plugs
Another subgroup in this category are routers with VoIP gateway that can simultaneously create a cable and wireless network. Thanks to this, in addition to the possibility of traditional connection of peripheral devices (cable), we also have the ability to connect other devices by radio transmission.
Another variation of this type of devices are routers with VoIP gateways and ADSL modem[1], which means that these devices can replace traditional modems for Internet access links implemented on traditional telephone lines.
Routers with VoIP gateway, regardless of the number of LAN ports, in most cases have one network input, in other words one WAN port to which the cable connecting the Internet can be connected. However, there is a group of devices with two or even four WAN ports. It is interesting in that the router can be connected to various Internet access links. What will we achieve with such a device? Three very user-friendly features:
Telephone connections can be directed to the Internet via one access connection, and thus network traffic (e-mail, websites, applications, etc.) can be realized via the second connection – so we have physically separated two different data transmissions that need other parameters for proper operation,
we have a backup link and in case of Internet failure from one service provider, the services supported by the damaged link can be transferred to the other,
having at your disposal two links, you do not need to duplicate the devices to manage these links (routers).
It is worth considering the choice of such a device, although it should be remembered that although the security of course increases through the use of two links (preferably from different ISPs), the fixed costs also increase – you have to bear the costs of maintaining two lines to the Internet.
Some routers with VoIP gateways have an additional telephone port to which an analog telephone line can be connected – it is an FXO type port. Thanks to this solution – as in the case of the second WAN port, it is possible to create a backup connection for telephone calls. There can always be a failure of the Internet connection, a failure on the side of the VoIP service provider or simply – to put it simply – there will be no electricity. What happens then? Thanks to the fact that we have a backup line in the form of an analogue telephone line, we are still connected to the world. It is limited, but we do. What other purposes can we use such a backup phone line for?
Sometimes it happens that a company has a phone number that is known to many of its contractors and wants to keep it – it can then connect it to its VoIP device (here we should mention the portability of numbers from fixed telephony to Internet telephony – sometimes it is better to do it and thus reduce the costs of maintenance of telecommunications services than to maintain an expensive, traditional telephone line, all the more so because there are no legal or technical restrictions on number portability to VoIP).
Sometimes such a traditional telephone line is useful for fax handling – sometimes fax transmission through VoIP devices and networks is not possible or takes place with disruptions (here you should immediately mention the possibility of using the virtual fax service – many Internet telephony service providers have such solutions, so that we can receive faxes, for example, to the e-mail box and send also via e-mail). Finally, we can use the telephone line from the traditional provider of telecommunications services to make calls to emergency numbers – some VoIP operators do not make such calls, which is conditioned by the nomadic nature of VoIP services and the lack of explicit legal regulations for VoIP networks.
Another port with which we can meet in routers with VoIP gateways is a port or ports enabling connection of a traditional digital link type ISDN[2] (two-channel link, so called ISDN BRA, ISDN BRI or ISDN BRI or ISDN BRI).

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