(Hi Gardo, I'll just be a minute, just passing through ...)
Please post your entire setup. I will assume your installation method is VicidialNOW, but you did not mention which version of VicidialNOW and there IS more than one. You must also list your vicicial version and build (from your admin screens) and your asterisk version. Also list whether there is any other software installed on this box. Thank you. This is a recording. LOL
Now:
Forbidden - wrong password on authentication for INVITE
from your pastebin.
first of all, this means your password is wrong, but it shows something a little deeper as well since it's your third direct call without being logged in to a meetme room.
what is your channel limit through this provider? (if you make two successful calls and then bork at #3 using the same dial plan ... you may have a two channel limit).
more importantly: are you trying to use vicidial or just asterisk?
Have you read the manager's manual and followed through the exercises to get your system up? or the VicidialNOW quick start instructions?