BT Business Total Broadband User Manual page 45

I have an ADSL master socket. Do I still need to use filters?
Q
No. When you get to Quick Start guide step 3, you'll simply plug your broadband
cable straight into the ADSL master socket's DSL socket.
A broadband (ADSL) master socket looks like this:
Can I connect more than one telephone to a filter?
Q
Yes. If you use a socket doubler, you can connect more than one phone to a single
ADSL filter, as shown here.
What do I do if I don't have enough ADSL filters?
Q
You can order ADSL filters at www.shop.bt.com/microfilters and most computer
shops or by calling us on 0800 800 152*.
You can still install broadband even if all devices don't yet have an ADSL filter, but
you must unplug any device without an ADSL filter from its phone socket. You can
reconnect the device once you've an ADSL filter for it.
* Calls to 0800 numbers are free from UK landlines. Mobile costs may vary. See www.bt.com/pricing for details.
All calls made to BT or from BT may be recorded to help us give you a better service.
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AD SL v1 .0