Actually you won't be looking for Voipo for neither firmware updates (will- you probably could but..) nor config files. Leave both of those blank.

Each telco port will have its own config page. I do not have access to a grandstream of my own to see what the fields are called but in a Linksys they are as follows..

Proxy- sip.voipwelcome.com

User Name (your 10 digit telco number)

Password (emailed to you)

Register - yes Use Auth ID - no

DNS use your favorite.. or 8.8.8.8 or your router gateway.. (192.168.1.1 192.168.0.1 ect)

Dial Plan- (*xx|[3469]11|0|00|[2-9]xxxxxx|1xxx[2-9]xxxxxxS0|xxxxxxxxxxxx.)



If you post some screen shots we can most likely help you out more.. Or others more familiar with the Grandstream may also come by..