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When your're on a call, you press Conference, get internal dial tone, dial the extension you want or 9 plus the whole outside number you want, then press Conference again to tie the calls together. Some exts only have access to one call at a time, so if you can't make 2 calls at a time, this feature won't work.
Ringing is assigned in system programming, very little chance it was changed by mistake. If Do-Not-Disturb was turned on, that could make a phone stop ringing. If it's just one line on a phone, maybe the system got put in night mode by mistake and night programming isn't identical to day ring. If you have direct access to the phone line check it for dial tone. Often virtual lines are used and you can't check for direct dial tone. On very rare occasion the ringer stops working, which can't be fixed.
If you recently dialed 4-0 or 4-1, those are Do Not Disturb and Call Forward codes. if this is what happened, then dial the cancel code for both, which is 4-2. This is with internal dial tone, don't grab an outside to do this. You could have someone dial your extension to test if the ringer is faulty. if their call comes in as voice announce, have them add a 1 to their dial sequence and their call should switch to audible ring, and you will know it's not a ringer issue. Adding a 1 can be done continuously if you want to switch back and forth.
Sorry, but there is no way to get this phone to work on your normal residential phone jack. It was designed to be used as part of a key system, which requires the control system (also called the KSU). The phones are a proprietary digital design and only work when attached to the proper KSU. Unless you want to try locating the rest of the system on eBay or purchase through some other vendor, all you can do with the phone is use it as a paperweight.
All you need to do is find the phone jack nearest to where you want the phone and plug it in. If the phone cord is plugged in properly, and the interior wiring of the house is in good shape, you should hear dial tone.
If not try moving the phone to a different phone jack until you do get dial tone.
hi,1.to adjust the ring tone volume. from your phone set,press speaker dial 601.press the arrow key up or down to adjust.
2. if your station is programmed as system admin phone,then you can press feature 80 feature.to toggle between day or night.do not press speaker button while doing this.
3.the headset port need to be program,or you can do without it,by purchasing the headset came with the adapter and connect thru the handset cord.
the new model is DTH-16D.
CAN email me if you need a new phone,