Oxfordshire - 01865 844 000
London - 0203 889 5555

Telephone Engineers
Need Emergency Response?

Got an issue? Our engineers are here to arrive quickly and rectify the issue promptly

Proud to have the finest telephone engineers in the business

At Commswise, we provide a range of telephone engineer services for all of our clients, be it an emergency or just a simple audit and install.

If you’re in the Oxfordshire or London areas, then we can help you with a variety of issues, from basic wiring faults to more complex and rooted issues; we’ve got it all covered.

Needless to say, we’ve been in this industry for years, and we’ve experienced a lot in our time. As a consequence, we know that telecoms problems can hit you when you least expect them.

Something can happen out of the blue, rendering your communications network useless. Regardless of the fault, we can send out some emergency telephone engineers to take care of the problem.

Virtually every building in the UK, let alone business, residence and institution requires fixed line telephony services installed by telephone engineers.

Besides making and receiving telephone calls this can be for a whole multitude of applications including broadband, fax, intruder alarm, fire panels, emergency lift, backup modems, EPOS, PDQ, door & gate access & PBX.


We cover everything!


Here at Commswise, we specialise in being able to offer a service that extends beyond what’s expected of us. As a result, we cover everything and anything relating to telecommunications.

This includes data cabling, wiring faults, broadband issues, ISDN line problems, telephone system issues, and so much more.

To put it simply; if you’re in need of a telephone engineer, regardless of whether it is an emergency or not, then we’ve got your back, now and in the future.




Need A Telephone Engineer?
Call us on 0800 279 0445

Alternatively fill in the form below

Emergency telephone engineers when you need them

If you have a problem that needs to be looked at right away, then our emergency telephone engineers are ready to come out on the same day.

It doesn’t matter what the time is; if you have an issue, we’ll be over as quickly as possible.

All of our emergency response teams are highly trained and come with years of experience behind them. As a result, they know how to solve any telecom problem in the book.

Nothing is too complicated for them, and no task is deemed too insignificant. If it’s causing you problems and preventing you from doing the important things you need to do, then it’s an emergency to us!


As soon as you recognise a fault or identify that something is wrong, give us a call, and we’ll send a team out to you as soon as possible.


We currently offer our emergency service to people in and around Oxfordshire and London.

This is because we have two offices – one in each city. Make sure you scroll down to find our contact information and ensure you call the correct office depending on where you live.

Our knowledge of both areas plays in our favour as it enables us to reach clients much quicker than any other emergency telephone engineers in the area.

We’re based locally so we can send out a team almost as soon as a call comes in. This reduces the time you spend waiting and means there’s more chance we can fix a fault on the same day.

If you’re in desperate need of assistance from a telephone engineer, then get in touch with Commswise today.

The best way to contact us for our emergency engineer service is by calling one of our offices. From there, a member of our team will talk you through what happens next, and send out a team to meet you.

We also offer general telephone engineer services if you have any problems that don’t count as emergencies. Feel free to talk to us about this if it suits you better.

If you need emergency assistance
Call us on the numbers below

Emergency response for Oxfordshire & surrounding areas
01865 844000

0203 889 5555

Our experienced telephone engineers we can help with...

Determine where the fault is and whose responsibility it is

BT no longer perform a straight forward online line checker. If your line is direct with BT and you do not have log in details dial 0800800154 and get it tested. It will mostly likely be a call centre in Chennai so be patient and clear as the understanding can be challenging.

If your supplier is not BT Retail it should be easier since your supplier should have direct testing facilities on Openreach’s WLR3 platform.

In all cases ensure you get a fault reference from them.

A word of warning here – most fault checks return ‘no fault found’. In many cases this will not be the case and it is then best to take matters in hand.

We recommend in all cases you perform some simple tests yourself. In most cases a simple telephone and star & cross headed screwdriver is all that’s required read more Locate the master socket.

Its important that the line is isolated from all other wiring and equipment connected.

The master socket should be an NTE5 or if with integral ADSL / VDSL filter an NTE5 A B or C – see here Having unscrewed and removed the bottom section of the faceplate the test socket should be exposed. Aside from the main incoming line this should have no other wiring attached to it. Attach your plain ordinary telephone.

If the line is dead / no dial tone contact your supplier – it is their responsibility. If the line is working dial 17070 and press option 2 – quiet line test. If there is noise on the line contact your supplier – it is their responsibility. If the line is fine and faulty with the plate reinserted it is down to you.

Fixing problematic and faulty wiring

Most common causes of wiring faults are water & moisture ingress or faulty equipment. If you are confident to tackle this read more or contact us.

Broadband related faults

Having established the line is healthy (above)  and the broadband is not it is very important to rule out anything your end.

Tip: it is very rare for the issue to be the Internet Service Provider (ISP) -over 99% of broadband faults are the line or the subscribers equipment. 

On the test jack socket of your master socket Check in this sequence >  connect the router > is it the same (on most routers you should have a solid green DSP light) > swap the filter in the test socket > patch your laptop into an Ethernet port on the router to ensure it is not a WiFi issue > Change the router (you will need the log on details from your ISP aka Radius details for this.  

To rule out your ISP you can also enter these details user > bt_test_user@startup_domain > password- leave blank or random characters > . The bt_test login bypasses connection with your ISP and allows you to browse to the test site   Open browser and go to http://www.bt.net/digitaldemo

An ISP telephone engineer arranged callout out will cost you a minimum £150 +VAT.

ISDN2e & ISDN30 faults

ISDN lines generally connect to phone systems or PBX for voice services.  If you have a line go down <   > you need to determine if the line is at fault or your equipment to save on expensive Openreach call outs.

Locate the NTE (network termination equipment). ISDN2e – when working properly the central green light should be steady.

Unplug the connecting lead or switch off your system;  with nothing connected it should flash green slowly. If not or its not lit at all it is almost certainly a network fault and contact your service provider.

ISDN30 –This is what the BT ISDN30 NTE should look like when working properly.

Prior to that the DSL1 light would be  flashing and the BT light red – indicative of an exchange (BT) issue.

If the cust light is on it is indicative of it being customer equipment ( your phone system)

Telephone system (PBX/PABX) faults & installation Infrastructure & underground telecom cabling

Office moves & relocations

Interested in using our telephone engineers?

Contact us and we'll get our engineers to rectify the issue for you