As far as I am aware, this should be possible.
Use the instructions for VOIP setup in the Owner's Manual.
If you don't have it, the manual is available for download at the manualslib website.
Naturally, you will need to know the SIP details for the Engin VOIP setup.....available from the Engin ATA (Analogue Telephone Adaptor you were using).
If you don't know how to access that, there are details available on the wonderful WWW. Use your favourite search engine.
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