Hello,
I am looking for recommendations on a UK based voip provider to work with on a project.
We need a SIP (preferable) or IAX trunk to our Trixbox server. This is actually located in our suite in Atlanta, so the company in the UK must have a solid transatlantic network. We need an 0845 number with call handling of up to 5 simultaneous calls.
We will need around 5000 outbound minutes per month, to local UK numbers.
Any suggestions/recommendations

Gradwell? Gamma Telecom?

We use Gradwell and they've been brilliant, both with service and support.

anyone tried magrathea telecom for UK ?? excellent quatilty but be ready for high rates.

A good friend of mine uses Gradwell, I hear no complaints from him. :)

Take a quick look at C4L (http://www.c4l.co.uk) to see if they suit your needs. Their rates are excellent for outbound calls and they have a solid UK network.
That said, I haven't tested their transatlantic network that much, so you would need to contact them for a trial to see if their connections are good enough for what you need.
Hope that helps,

we use sipgate for our UK trunks, are pretty decent to work with

Another vote for Gradwell :)

My vote goes to Andrews & Arnold ISP. They are a technical focused ISP, that offer SIP and IAX Trunks to anyone who wants one!

I would post a link, but can't yet...

Andrew

Another vote for C4L
Their transatlantic network is absolutely ok

They located in phildelphia and peering with L3. Their network is great but only support SIP.

Their rate to UK is cheap as well be able to provide you with a local UK did for inbound.

I would gave them a try.

PM if you need me info on and our about them