Well. I tried before to remove that VSP from the list then I added it again a few minutes later. I'll try this again but this time I'll wait a few hours.
This setup worked for a couple of weeks flawless. There is no call forward of any kind with that VSP. The most strange this is that if I connect it via ATA without using voxalot as an intermediary the VSP works fine. When I set Voxalot to connect to this VSP and I connect my ATA to Voxalot I get problems.
VSP is a brazilian provider called "TMais"
voipMais | TMais VoIP
sip.tmais.com.br
port 5060
regards
gelcom