It Gives an extra 30 Digital station (DS) ports for advanced phones
Same usefulness as the IP400 Digital Station 30 V2 however with coordinating outside of IP500 control unit
Bolstered by IP Office center programming level 2.1(31) least
Good with IP403, IP406 V1, IP406 V2, and IP412 control units and IP500 control unit running Professional Edition
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