Using secondhand VoIP phones

As part of our work to support the local Covid-19 support group we are lending VoIP phone handsets to some of the organisers. The handsets are programmed to use the special range of distinctive numbers allocated by us to the team. To ensure good quality voice on the phone we are using Polycom desktop handsets, these are business quality devices designed for office use.  Once programmed by us, it should be just a matter of plugging the devices into the the RJ45 LAN outlet on the broadband router in the home and, after power is supplied, the devices automatically connected to the Sipgate service. The organiser team then obtain the full facilities of a distributed office PABX in their own home. It also protects the personal phone numbers of the organisers from general public exposure. There always are some weirdo's who would want to exploit personal phone numbers.

When purchased new, these handset have a price of circa £75 - £100 as they have quite powerful micro computers embedded in the device. In order to keep costs down we've purchased secondhand units from Ebay. These are fully functional older units no longer required by businesses, but look like new devices. They cost less than £20 to purchase including delivery.  The particular model we are purchasing have dual power options. You can either buyer dedicated mains power supply units delivering 24V, or they can use PoE (Power over Ethernet cable) which has power delivered via the network cable. The PoE option greatly tidies the cabling associated with using the phone, all that is needed is a single CAT5e network cable plus, in the home environment, a power injector unit close to the Broadband Router.

When used in conjunction with the Sipgate web browser interface you get "click and call" facilities from the VoIP phone with no need to dial the phone number via the handset keypad. You just click on the number and your handset rings. As soon as you pick up the phone handset, or press the speakerphone button, Sipgate will connect the call.

Well, that's all of the theory, now for the practice. When we received the secondhand devices, we found the units still had their programming from their previous owners. Some the previous programming was quite specialised. Normal configuration programming by us did not allow the phones to function correctly and connect to Sipgate. After a lot of research, we realised we had to completely wipe the memory on the phones, not just a standard "factory reset", we had to reformat the memory using a well hidden function on the phones. We then set up a FTP software server to hold the appropriate historic version of the software and basic configuration files. We were able to track the software and files down on the Polycom support website. It took quite a lot of Google research and the downloading of multipage administrator manual pdf files. Normally telecoms engineers go on training courses to learn these processes, we didn't have that luxury and spent about five hours hard work and experimentation to getting it done. Now the phone automatically visit the servers via the Internet, to pick up the latest configuration when they are powered up or restarted.

However once we'd "cleaned" the handset memory and reloaded the phones with new copies of the software they work just fine. Now that we understand the process, it is quick and easy to remotely program the handsets. It was time well spent. We're about to handover the devices to the volunteers, plus network cables and power units, all suitably sterilized with isopropyl-alcohol wipedown and exposure to UV-C disinfection lamp. 

We already use VoIP phones in the holiday cottage, but there we'd installed a brand new handset so we didn't have any configuration problems.

Edit: 21st April 2020
The only remaining problem is get the recipients of these VoIP handset to plug them in and to use them  So far the reprogrammed handsets have not been connected following delivery. There are no reported problems.

Edit: 26th April
The recipients of the VoIP phone have called in an engineer to sort out network problems in their own home.

Network Upgrade at the cottage complete

Following the earlier plans, yesterday at the cottage the Broadband internet connectivity was migrated from the old ADSL method (Plusnet) to the the faster FTTC internet connectivity. This is the service type named as "Superfast" by the underlying provider BT Openreach. I hadn't been aware of the exact timing of the changeover, but was alerted by an email just before noon to my smartphone. The message was that the Ubiquiti access point in the cottage had become disconnected.  Our UniFi cloud-based network monitoring tool keeps a constant eye on the network access point device, connected devices, and lets me know of any problems. I checked online to discover there's only been a couple of minutes of outage.

I took a trip to the cottage later to check what Internet bandwidth was actually being delivered. The raw figure is 78 mbps download and 18 mbps upload with a 24 msec ping time. This is a good result for future guests in our cottage. I've set the Guest Wifi (password protected and encrypted) band to 45/5 mbps. This should be more than adequate for a couple on holiday. I reserved some bandwidth for the network cable connected VOIP telephone provided in the cottage.  There is also an open unencrypted Visitor WiFi service which I've set to 6/0.2 mbps for casual visitors. The cloud network management allows me to remotely rebalance the WiFi at a moment's notice.

As part of the routine turn-around process for new guests at the cottage, I reset the access password for the Guest WiFi. We leave a note of the new password for incoming guests. This limits the number of people who can access the faster WiFi service. We could run a voucher system, built into the Ubiquiti system, to control access but it is an over complication. The access point is set so that guests and visitors devices cannot directly interact across the WiFi LAN.

The Broadband upgrade was a simple process. Plusnet sent me a new router via ParcelForce to our home. I took this unit to the cottage and plugged it in to the old ADSL service. It worked without problem. Plusnet requested BT OpenReach to switch to the FTTC service. That is what happened yesterday, unattended, with a down time of a couple of minutes.  When I visited the cottage I altered the settings on the PlusNet Router to turn off their standard WiFi delivery, choosing instead to delivering WiFi via my Ubiquiti Access Point. which is connected via Power over Ethernet (POE) network cable directly to the PlusNet router. The faster Internet service increases our costs by approximately £5 (GBP) per month, but the improved network performance for our guests is noticeable.

Last night I used the UniFi cloud based network management tool to remotely upgrade the resident software on the Ubiquiti Access Point in the cottage. It just takes a couple of mouse clicks from my desktop PC at home and only leads to a few seconds of service outage. Timing this process carefully avoids any disruption to our guests.