As integration was developed based on older version, I suggest you to test if it works with 3CX Phone System version 15.5.
Also, you could ask other partners. Might be they have customers using this version.
same v. 2025-02-24. New DB. Just forward balances (purchase, sales invoices) from 2024 and later. In your case does turnover per period differs or just fwd. balance differs and turnover is identical i...
