Is your software "Restricted" or "SP"? Restricted means you can have up to 4 lines & 8 extensions. SP means you have 8 Lines & 16 extensions...
It's written on the card...
However, There also could be added key codes that have been already added...
Check out my FAQ too as it explains all that R, S, SP & SIP stuff and shows the version based on the 2 letters of the SP code (case sensitive).
In your case RP is Restricted with Prompts, Ni = 4.1
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