![]() VoIP is not one protocol but many working together and the range of possible settings runs into the thousands. If you’ve procured your phones second-hand as we did, they’ll probably need resetting before going any further. The phone can be set to take priority over the data if required (QoS or quality of service) so phone calls still work if you’re downloading the latest Fortnite update. Most VoIP phones feature a passthrough Ethernet connector, so you can chain other devices without using up all your switch’s ports. For best performance, we’re going to wire everything up ‘the old-fashioned way’ using a small Ethernet switch. As a result, many VoIP devices, including our choice of phones for this tutorial, do not feature WiFi. VoIP systems rely on fast networks with low latency to maintain audio quality. Finally, ‘soft’ phones such as Zoiper can run on iOS/Android devices or on your computer. Alternatively, you can use an ATA converter that adapts a traditional PSTN phone to VoIP (although you lose some features). Many other types of phone are available, including DECT-style cordless. These are older devices, so you can pick them up on auction sites for as little as £10. We’re using the popular Linksys SPA941 and Cisco SPA504G SIP VoIP phones. You’re not constricted to a traditional phone. One of the great things about VoIP phone systems is the flexibility. 2 × VoIP devices (like the Cisco SPA504G).This article first appeared in The MagPi 78 and was written by PJ Evans You'll need At home, why not have phones for your study or kitchen? Leave a voicemail for the dog! Small businesses can get up and running with a two-phone PBX including all the cool features for under £100. Yet, with the help of Voice over Internet Protocol (VoIP) and the popular open-source telecoms platform Asterisk, the humble Raspberry Pi can match the features of the most expensive PBX systems. Even a simple system can cost thousands to implement. Traditional private telephone exchanges (PBX) are essential for businesses but come at a premium.
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