about configuring ata's

[usa2k]

You chose the number you assign to each line.
It can be the same number to become a cloned line.
If they are two different numbers, they are two different accounts on the one ATA.
You can also leave the second line disabled - all depends on what you are selling.
Or leave the first line disabled ...

[timreichhart]

thanks usa2k for that info and now am I able to set the passwords for the lines or not?

[usa2k]

Yes, the managed ATAs let you set user pass and admin pass.
Also you can chose the port numbers.
If you have many ATAs on one network, you can set the ports all different
(Rather than 5060/5061)

You can suspend and cancel accounts too.
Just be careful - cancel is permanent!