First phones were TXX series... so T18P, T20P, T22P, T26P, T28P etc. Higher numbers meant more buttons/bigger phone/more features. (if I remember rightly the T18P didn't even have a screen on it). Here, the P actually designated POE support. So they had T22 and T22P versions, one which only worked with power adapter and one which could be power adapter or POE. Eventually as costs of POE circuity dropped the non-poe models went away leaving only the T2xP models. The Yealink T57W is specifically designed for executives and busy managers with a heavy call load. Integrated modern technology 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.

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. 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 .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 Go to for following folders and delete all files and subfolders in them (NOT the root folders themselves though!):

C:\ProgramData\3CX\Instance1\Data\Http\Interface\provisioning\\firmware\C:\ProgramData\3CX\Instance1\Data\Http\Interface\provisioning\\firmware_new\ If 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. 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). 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:Upgrade its firmware to the latest 3CX supported version. See how to do this here . Note: If you are planning to install a router phone, read the section below regarding the firmware requirements.

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.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 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. 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.