I'm assisting someone that has moved their mailserver home from the office and pays for their static IP address aswell as their home broadband plan (under the family name) on seperate accounts.

They have been using the old cisco dsl router at home but due to problems with the connection constantly dropping, I've installed another adsl router which is currently set to receive a dynamic ip and has been configured with familyname.xadsl@isp.co.nz

I have no access to the old cisco (I may do if I can be bothered soldering up a communication cable), so I have no idea how it has been configured at this stage.

I'd like to know whether or not the static ip address is attached exclusively to the other account credentials eg. businessname.xadsl@isp.co.nz (which is what the cisco has no doubt been using) or whether its specific to the line itself and the static ip will be granted regardless.

Unfortunately I'm offsite and can't reboot the router to check whether or not the ip remains static. I'm guessing it doesn't and I'm going to have to use the business login credentials?
I'm also guessing that if so, I'll need to aquire the static IP address from the isp so that I can manually enter it into the router's config??

Any assistance would be greatly appreciated.