I have located several options for you, and I am hopeful that at least
one of these devices should suit your purposes perfectly:
"The Stick is a programmable, three-port switch. Connected to a single
incoming telephone line it provides three ports (RJ11 with BT adapters
provided). These are set up for Voice (phone / answering machine), Fax
and Modem but you can use other combinations of telephone devices. It
can be connected to the master socket or to an extension socket.
In its default configuration, The Stick will recognise incoming fax
calls and divert them to the Fax port. Modems dialling in must issue
the correct Security Access Code to reach your own modem, thus your PC
and data are protected. Voice calls will go to the telephone /
By default, The Stick auto-answers calls on the first ring, screens
the call for fax tones or DTMF, then rings the appropriate port.
However you can, in effect, set it to manual answer mode by delaying
auto-answer for up to 10 rings.
You can manually divert an incoming call to another port by dialling
its code. The caller can also route the call if he knows the code.
Each port has a programmable access code (extension number) of up to
four digits. So, for example, if you are sharing business and domestic
phones on The Stick, all calls in the evening could go to the
answering machine except those from authorised callers who would dial
the code to get through to your private telephone.
The Stick provides barge-in protection, which means that a call in
progress cannot be interrupted by another device. (Obviously this only
applies to devices plugged into other ports on The Stick.)
The Stick has an Unanswered Call Transfer feature. This means you can
program The Stick to route unanswered calls to another port after a
specified number of rings. Programming The Stick is achieved simply,
via your telephone keypad.
The Stick is designed for the USA but is sold here ready for the UK
market with BT connectors, UK mains adapter and with a manual
re-written for the UK. There is a UK Tech Support telephone number for
our customers. Please note that the ringback, heard by voice callers
when The Stick auto-answers, is the US-type ringback.
The Stick will work on ordinary, analogue (PSTN) telephone lines. It
will work on broadband (ADSL) lines off the voice socket of the
microfilter. It cannot be connected directly to an ISDN line."
Delta Computer Services: The Stick
"The Fax Friend is a two-port switch. Connected to a single incoming
telephone line it provides two ports (standard BT sockets) which can
be used for a telephone and/or answering machine on port 1, with a fax
machine or fax modem on port 2. It can be connected to the master
socket or to an extension socket.
The default configuration will suit most installations, however 4 DIP
switches provide customisation of ring delay etc. the Fax Friend will
recognise incoming fax calls and divert them to the fax machine. This
will happen whether you answer a call manually or the answerphone
takes the call.
If you do not answer manually and the answerphone does not answer, the
Fax Friend will route the call automatically to the fax machine after
4, 8 or 12 rings or never (programmable via the DIP switches).
Silent fax calls can be manually routed to the fax machine by dialling
a 2-digit code.
When a voice caller wishes to send a fax later in the conversation,
the call can be manually routed to the fax machine by dialling the
Notes: Although marked as an Avro Pacific product, this company
appears no longer to exist; however we will provide a one-year
guarantee according to our terms and conditions. The Fax Friend may
also be branded as the Line Wizard or XtraLine Fax Switch."
Delta Computer Services: Fax Friend
"The LineShare 5000x range comprises two models, the LS5000A and
LS5000B... Both models recognise incoming fax calls and divert them to
the fax machine... The Lineshare 5000A is designed primarily for
unattended installations as it answers all calls automatically. It
then listens for fax tones, modem tones or DTMF tones and routes the
call accordingly. If there are no tones it then rings the phone and
The LS5000B will typically be used in small-office / branch-office
situations which are attended for at least some of the time. The
LS5000B waits for a person or the answering machine to take the call.
It then listens for fax tones, modem tones or DTMF tones and routes
the call accordingly; if there are no tones, the voice call continues
With the LS5000B you no longer need to remember to set the answerphone
when you go out! Leave it permanently set and let the LS5000B take
care of it. You can manually divert an incoming call to another port
by dialling its code.
The The LineShare 5000x range is manufactured in the UK by Lineplex Systems."
Delta Computer Services: LineShare 5000x Range
My Google search strategy:
Google Web Search: "fax voice switch" OR "automatic fax switch" uk
I hope this is helpful! If anything is unclear or incomplete, please
request clarification; I'll gladly offer further assistance before you
rate my answer.