What do you mean by "the one found through my network"?
Is this the number displayed when you log into the box via the local web interface (via the device's IP address)?
The OBi numbers shown on the OBiTALK portal and on the local web interface should be identical. If not, you could delete the device off of the portal, factory reset it, and start over to configure it.
One way to conclusively prove which number is right would be to call the two numbers from another OBi device, and see which one rings. If you don't have access to another OBi, and you want to settle this, you can PM me with the full OBi number and I'll call you.