The J Series handsets can be purchased in two versions.
Please be advised that this is to the best of CommsPlus knowledge. The only 100% way to know that a phone can be connected to an IP Office would be to reset the phone to default and connect to an IP Office to confirm compatibility.
Product ID codes (found on the back of the handset) Avaya IPO firmware handsets.
J129 - 700512392
J139 - 700513916, 700513918
J159 - 700512394
J169 - 700513634
J179 - 700513569
J189 - 700512396
Product ID codes (found on the back of the handset) 3PCC (3rd Party Open SIP) firmware handsets.
J129 - 700512969, 700513639
J139 - 700513917
J159 - Unknown
J169 - 700513636
J179 - 700513630
J189 - Unknown