What is the difference between a base station and a sub-station in an intercom system?

Try pressing the intercom button (base) above the number 1, on the handset the intercom button is below the # button.
Intercom?
Whenever the phone is in standby, you can make an intercom call
between stations without using the phone line.
?
You can make an intercom call from any station, but only two stations
can be in an intercom call at any time.
?
If an outside call comes in during an intercom page, the phone cancels
the page so you can answer the incoming call.
?f an outside call comes in during an intercom page, the phone cancels the page so you can answer the incoming call.
?
If an outside call comes in during an intercom call, press
speaker on the base or talk/flash on the handset to hang up the intercom call and
answer the outside call
see page 15/16 of the manual at the link below.

http://www.uniden.com/pdf/D1688-2om.pdf

Check power supply for proper voltage of 12 volts DC.
-If there are multiple Hubs, check voltage on all Hubs
If the voltage is not 12V, try replacing the power supply
226888 Power Supply
-If the voltage is ok, disconnect 1 room station at a time. If there a multiple Hubs, disconnect the last Hub. As each room station and/or door station is removed, have someone else listen to see if the squeal goes away. There is a chance that one bad room or door station is causing the issue.
oIf the squealing stops, add in the previous stations that had been disconnected. If all stations other than that room station are ok, do not hook up that station. There are no replacement stations available for this system. If the squealing continues with any of the stations hooked up, there is a bad HUB. DMC-10 Hubs are NLA and cannot be repaired. The best option for a replacement is the I2000 Kit
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To Page another phone to initiate intercom:-

From the base station - press Find hs/Intercom.
From a handset - Press Intercom/clear.

Then select the station you want to talk with or All to
page all stations at the same time.

To answer a page:-

From the base station - press Find hs /Intercom or Speaker.
From a handset - press Intercom/clear or Talk/Flash.

Hope this helps

Ive also included a link to the D1785 Series User's Guide








http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/D1785om.pdf

Tries somes ply woods make a rectangles boxes for it each one of units might have more protection of the radio wave interferances.

Toshiba DKT2020 set work with a lot of different Toshiba systems. That being said this should get you in the right direction.

Date

• From receptionist station, without lifting the handset, press "Intercom"
• Dial "#651"
• Dial the time in YY:MM:DD format.
• Press "Redial" or "#".
• Press speaker.

Time

• From receptionist station, without lifting the handset, press "Intercom"
• Dial "#652"
• Dial the time in military format HH:MM:SS.
• Press "Redial" or "#".
• Press speaker.

Day of the Week

• From receptionist station, without lifting the handset, press "Intercom"
• Dial "#653"
• Dial the day of the week (1-7).
• Press "Redial" or "#".
• Press speaker.

If you're trying to get 5 handsets to work with one base, it won't work. The 4215 can only handle 4 handsets, the base handset plus 3.

When I had to replace the base of my 4 handset system, the base handset still worked. Therefore I had an extra handset which couldn't be used. So I decided to buy another base. Now I have 6 handsets which can be grouped 4,2 or 3,3.

make sure each and every phone has its own ID. That solved problems for me for all but one phone.

If you program that button to ba a DSS button for that station (41) it will intercom that station, can be used to transfer calls to that station, and will light up when it's busy. It could be called something else in programming like Station Intercom Button, Quick Transfer Key, etc..

Problem is, your phone can be used on many different Avaya phone systems that all program differently.

The manuals for the phones and systems are all available free at www.avaya.com but you need to know which system you have before looking for the manual.

On the hand set:
- menu button - ADVANCED SET - REGISTRATION - base 1
- pin # is 0000 (default)

On the base station and the base station handset - press and hold for at least (3) seconds, at the same time:
- on base - the intercom button
- on base handset - menu button

It's in the manual but you need a magnifying glass to read it.

Each of the six phones must have line 1 connected to the same "subscriber loop" (the same phone number). Assuming this is the case, and that you have not assigned any numbers to the the top six speed-dial buttons, each station will have agreed to be assigned a station number.

From any station, pressing the speed-dial button for another station's station number will page that station.

Now, how to properly initiate an intercom conversation differs between announcing to another station that a call is on hold, or a "cold call".