One of the more common things I see on lists is asking for what billing platform to use for your ISP. I have put together a list for ones to help you in your research. These are presented in alphabetical order. These can also be found on https://startawisp.info
There are many more platforms in the Telecom world. Some are just for inter-carrier billing or integrating with other systems. I have listed some of the more popular ones which do more than just invoice generation.
Zoho and Zoho One
UCRM by Ubiquiti
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