Their specification says that they do. I've sent the trace to them.

Thanks

On Mon, Jan 31, 2011 at 10:28 PM, Paul Cupis <paul@cupis.co.uk> wrote:
On 31/01/11 20:55, Jonas Gauffin wrote:
> Here is the reinvite when I've enabled t.38:
>
> Have I configured something
> incorrectly or why do my gw provider respond with 488?

It looks like your provider does not support T.38. You should ask them
to confirm whether they support it or not, and if they say they do ask
them to look at a failed call.