See my thread, "VSP problem", for this.
They have switched infrastructure over the weekend, and were (for some reason) mostly rejecting anything now not using DNS SRV, and referring anyone back to their ATA manufacturer for SRV support.
I CAN ring the 121 answerphone, but can't connect anything else. Voxalot does not show me registered.
VoIP.co.uk :: Platform Status shows an update on the possible problems, but it's bl**dy annoying as it's my only VSP which does all my PSTN routing (yes I can drop back to POTS but it's a PITA!)
I am now (this morning) showing "Online/SBC" with Proxy/SRV on the voip.co.uk status page - but my Voxalot page just shows "-" for the registration status.
I'm at work, so can't test the thing easily until later.