We provide voip and data services to customers and need to keep track of the information related to the one or many services.  

• If its a voice service, then we will have to store the login information, etc.
• If its a data service, then we would have to store the speed, IP address, contract duration
• There are also several other types of services each with their own properties

I have the CRM and product modules installed but the product module seems to only be for a one-off sale of a physical item.  Can anyone recommend a way to store a customer's ongoing services.