We have a few different extensions in our office, some ring when an in-coming call comes in and some don't. How can I change each extension to ring / not ring when call comes in
The first thing to check is the total "Ring Equivalent Number" or "REN". This is a maximum number that your line will support. For example if the line REN maximum is 4, then it will support 4 phones with a REN of 1 (4x1=4). If, however, you have 3 phones with a REN of 1.5 each then it won't work (3x1.5=4.5). It may work on 2 of them and not the 3rd one, but equally it may work on one or none at all.
The REN is usually on a label on the phone or in the manual, but the line REN is set by your supplier and you will need to contact them for that number.
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