Ummm Dunedin
Didn't know that Nokia where doing a headset too.
Currently won't work with NCP2, reason being that
a) NCP2 has no Bluetooth
b) Can't route BTooth through the iPAQ cos NCP2 only takes voice input via the headphone jack. So using the 38*0 iPAQ devices ain't gopnna help ya
But, I wouldn't recommend the NCP2 anyway - No GPRS support and with Voda declaring that they won't do HSCSD (High Speed Circuit Switrched Data = basically multichannel ISDN over mobile) the NCP2 is gonna get left behind pretty quick.
Better to wait for the release of the iPAQ GPRS jacket, or the O2 phone being OEM by TCM, the guys who manufacture the iPAQ for Compaq.
http://www.pocketpcwriter.net/stories.php?story=01/11/27/6191121
If ya need something urgently then a combination of 3870 (bering in mind they are scarce as hens teeth in NZ atm) and an r520 or t68 plus an Ericson BTooth Hset would be a bloody good combination.