Hello all, does anyone know if it is possible to assign more than one MSN to a handset?

I'd like to connect my Beocom 6000 ISDN with 3 handsets to a telephone system and to make it work correctly every handsets needs 3 MSN: 1 individual MSN for each handset, 2 group MSN for first call reception, 3 group MSN for third call reception.

Thanks and best regards

Marcus