Three questions about it:

1. Is possible to connect 1 DPIM with 2 Door Phone?

2. How I can do it?

3. The connection between DPIN and Door Phone is analog?

1 - Never tried, but I doubt it

2 - If you can then you would parallel the
connections up

3 - Since its 2 pair between the Door Phone and
DPIM I would guess its digital, Never seen a
2 pair analgoue connection

I have not been successful... because they are digital door boxes they need their own extensions... you could however use a different brand door phone (viking) and use it as a single line extension, you would just have to have a separate power source.

It MIGHT be possible to parallel two door boxes off one DPIM, never tried it but you could try that.

For SURE, you can't do two phones off one station port, but the door phone is much less sophisticated and just might work.

You wouldn't be able to open two separate gates or doors for sure.