Just paired an Aliph Jawbone Prime. Pairing seemed to fail initially, then the two seemed to silently work things out between themselves -- a call came in and routed straight to the BT headset when I wasn't expecting it.

A bit later, some phone calls I initiated using the headset failed to route the audio through to my ear (other party hung up claiming they were talking but got no response from me.) However, after 3 or 4 repeats of this, the headset started working normally.

Perhaps Jawbones and the N900 start off on rocky footing, but through persistence and maturity manage to work things out amicably between themselves after a bit........