Thanks everyone for your responses. I’ve edit te settings in the SPA3000, but without succes. I get the message ‘all circuits are busy now…’. 
I’ve contacted Vodafone, but they don’t give the login settings to connect to their SIP servers. I don’t know why, but it is very, very, very stupid. I think it will not work with the SPA3000. It shows registered in FreePBX, but outbound/inbound calling don’t works. Not now, not about 1 year. If anyone has ideas to get it (maybe) working, let me know. 