Don't know if this is the right place this question, but ...
If a company has ISDN for it's telephone system, how does it connect to the external network (e.g. normal BT network) to get broadband services.
Does it have to go with any specific ISP because of it's ISDN network.
For example, is there any reason why the company could not go with say Plusnet, or BT, or Virgin
