I purchased a incoming DDI to use with an IAX trunk to my server, since setting it up, I have been unable to dial in and actually understand the person answering the phone, the quality is appalling. SIP phones locally and remotely are perfect, so I know it's not my end.

Anyway, I logged a support call on the 8th April and received a response from one of their team on the 9th April. Since them and repeated emails from me, I have not heard a single word from them despite me chasing them for an update. At this time, I have given them 24hours to respond or I will look into taking the matter further demanding a refund of monies paid and they will lose a customer.

I would personally steer well clear of VOIPTalk.

I have tried half a dozen providers prior to voiptalk and there were always niggles with them (incompatible hardware, calls dropped). It's hard to determine who is and who isn't a good provider but i suppose proof is in the pudding. I have also noticed that voiptalk has services geared for business which also means that I can get phone support if I buy one of the pricier services.

The difference between using my router with a standard pots analogue phone and a dedicated voip wifi handset is the first remains permanently "registered" and the second registers on and off all the time.

Seems to me that the tech problems are all connected with "registration". Constant registration works fine all the time, occasional registration screws up the system.

Throw in user error on set up sometimes and it's a recipe for unreliability. In the beginning I experienced every problem, Dropped calls, incoming call timeouts, bad quality, etc etc Hard to know if it's user error or technical trouble.

Now it's ok.

The £9.99/month "all calls inclusive" deal does not seem to be attractive to UK telephone users.

I have used Voiptalk on and off for over a year. The only real reason for the off bit is that I changed systems and suddenly it didn't work and required the time to set it up and troubleshoot. Configuration can be a pain when this happens (finding what the problem is)
If you consider the price point (low call charges and good facilities) I think the service is great - when it configured and up and running
I consider this an 'early adopter' service choice - meaning you get low prices and should expect to have to make some effort yourself to get it all set and sorted. Once sorted it generally just gets on with it.
I tend to think of it as "once it is working leave it alone!"
Call quality is mostly good and often better than normal landline: I am now going to try using it more often as my primary outgoing solution (with landline as backup of course).
I would recommend the free or Silver Service (gives incoming number and better call rates) - NOT the 9.99 per month option which is overpriced. The call rates are very low; as should be expected from VoIP

If you want a service that just works and offers instant support and fixes then this is not for you but if you are prepared to go the extra half mile they do what it says on the tin and you get great call quality for very low prices.
I have been talking to my family in Switzerland from UK for over a year for free. Great !

Unreliable service - one day it's fine, the next day dropping calls, poor line quality, number unobtainable. They have major quality problems to overcome before I would recommend them to anyone.

Automatic provision problems at VOIP talk(i.e. your bank gives them the money, but Voiptalk think not and then they don't allocate you a product) and you have to wait days for them to figure out they have got your money, and they eventually give you the service.

Great rates for International calls with VOIP Talk- 1p per min to Iceland, Cyprus, Sweden for example on their Silver package costing only £2.99/month with a host of other features and benefits included into the price.
Call quality is excellent using my VOIP router
Customer service answered my enquiry within 5 rings and provided me with very useful install and set-up information

To be honest - yet I can't really fault them - more features and benefits than the likes of Vonage or Sipgate - at a lower costs without sacrificing quality of service - to me this means I'm getting VFM (value for money)

If you want to use VOIP, I suggest you find another provider that provides a little support than VOIP Talk.

The idea behind Voip, and please correct me if I'm wrong, is to provide us, the consumers, with LOW COST telephone calls through our broadband connection.

Quote from website:
With our VoIPtalk Unlimited residential package you can make unlimited calls to UK and international destinations from as little as £9.99* per month.

Hang on a moment!! I wish no disrespect, but £9.99 for unlimited may sound cheap, BUT THIS IS VOIP! I can get it for less with my landline through the likes of Toucan or Talk Talk.

Come on guys. You need to halve your prices at least before people will even consider Voip from you.