Yealink doesn't really breakdown/explain their naming concepts, but having dealt with them for many years I can give you a bit of brief history to help clarify things a bit: A built-in USB 2.0 port allows you to enjoy USB call recording via USB flash drive. Via this USB port, you also can connect a wired/wireless USB headset (sold separately) without connecting an adapter, and connect up to three (3) Yealink expansion modules EXP50 (sold separately), programmable with up to 180 paperless DSS keys. Efficient installation and provisioning

A built-in USB 2.0 port allows you to enjoy USB call recording via USB flash drive. Via this USB port, you also can connect wired/wireless USB headset without connecting Yealink EHS36 anymore, and connect up to 3 Yealink expansion modules EXP50 which can be programmed with up to 180 paperless DSS keys. If the phone is used and has been connected to another PBX system, you have to reset it first . See how to do this here . The T4XS became the primary line. At the same time though Yealink had been getting into the video conferencing business, and I expect as some compliment/evolution of that they decided it was time for a new high end phone series (The T4xS were cool but they didn't have that "new" feel anymore). This is where I expect the T5x series originally came from. With the adjustable high-resolution display available on the T57W phone, you can switch angles to your liking and under a variety of lighting conditions. This will ensure an optimized user experience. Enjoy clear callsIf this is the first phone in your network, make it a router phone. If you have others choose whether to make this a router phone or specify the router / SBC for this phone. Go to for following folders and delete all files and subfolders in them (NOT the root folders themselves though!): You need to know if 3CX is in the cloud or not. If you have 3CX hosted by 3CX or you have 3CX FREE/SMB, then your 3CX is in the cloud. 3CX is in the cloud Yealink SIP-T57W IP Phone features an adjustable 7-inch capacitive touch screen that you can readily adjust it to the comfortable viewing angle according to yourself. In addition, clearly defined set of menus is easy to navigate through when all you have to do is touching the desired option, that ensuring you an optimized interface for a smartphone-like user experience.

The Yealink SIP-T57W supports efficient provisioning and effortless mass deployment with Yealink’s Redirection and Provisioning Service (RPS) and Boot mechanism to help you realize the Zero Touch Provisioning without any complex manual settings. The Yealink business phone supports up to four cordless handsets via a DECT dongle. You can now switch calls between the desktop phone and the cordless DECT handset in no time. Yealink knows how important it is for users to have a clean and neat workspace. With the wireless headset's connection to Bluetooth and Wi-Fi, your space will remain uncluttered. Yealink T5 business phones are equipped with an adjustable high resolution display and LED indicators, Android 9.0 OS to improve the data encryption, authority management and more. It includes built-in Bluetooth and Wi-Fi. Each phone can be connected to 4 cordless handsets with the capability of switching calls between the desktop phone and the cordless DECT handset. Then over time they evolved some of the most popular T phones to include gigabit switches. These became the T3x series and were suffixed by "G" to indicate "gigabit"... so T38G, etc The T3x were a stop gap measure as they still had the same form factors as the T2x. To keep up with the times, Yealink introduced the more "modern" T4X designs. Since they also originally had 10/100 and Gigabit variants, those models became T4XP or T4XG depending on the switch built into them. In reality the P variant really only hit low end units, and before long the G version was the defacto.For T53W they were aiming for a lower more basic/common use phone that would fit the same form factor/look consistent with the rest of the T5X series. So just like the T41 that's now at the bottom end of the T4X series, you get the original version (T53W) and the "stripped down bare bones" version T53. The Yealink SIP-T57W IP Phone features a 7-inch capacitive touch screen that you can easily adjust to a more comfortable viewing angle. In addition, the clearly defined set of menus is easy to navigate through when all you have to do is touch the desired option, providing you with an optimised interface for a smartphone-like user experience. HD audio Note: If you don't want to use RPS, you have to enter the provisioning URL into the phone via its web interface. The phone will be configured automatically and then restart. Use the DHCP option 66 if you have a large number of identical legacy phones (as the URL is different for each phone). The way our software determines of the offered firmware is newer than the one on the phone is by comparing all 4 numbers of a firmware version.