Better double check with Sprint Nextel on that, I had one person from Sprint about a year ago tell me the two will not inter-communicate.
That person was either
a) totally wrong
or
b) misunderstood what you are asking...here are the facts:
1) You can direct connect between Nextel and Boost as long as both phones run off the Iden network (with the PTT button on the side and require sim cards)....
2) You can NOT direct connect between the CDMA versions of Boost to the Iden Versions on Nextel...at least NOT yet....
3) You can NOT direct connect between regular Sprint CDMA phones to Iden Nextel phones...
4) You CAN use Sprints new Q-Chat on select new CDMA Sprint handsets to Direct Connect between those CDMA handsets->Nextel Iden....but that feature is only available on select CDMA Q-Chat capable handsets at this time...
Hope this helps!
Marshall KE4ZNR