Thus spaketh me@privacy.net:
> On Fri, 20 May 2005 10:20:59 +0100, David Floyd <david@floyd.org.uk>
> wrote:
>
>> Can't log in to 1899VoIP this morning using ATA-486.
>>
>> Tried sip.1899.com and iax.1899.com which both worked yesterday.
>>
>> Does this confirm that they have pulled the plug on us non softphone
>> users.
>>
>> I presume that their softphone must send some other information so
>> that they know when it's being used.
>>
>> DF
>
> My Sipura is incapable of accessing 1899 VOIP. Until a couple of days
> ago it worked fine, and I haven't changed the settings.
>
> Is it just me or are others in the same boat? It says it's registered,
> but when u try to call PSTN it just goes beep, beep, beep.


Sounds like the classic blocked number that has been plaguing many.

Register another number with 1899 and then program that new number into the 
Sipura.