They have/had a Motobridge system, I don't know if the dispatch upgrade for NYPD and FDNY with MCC7500 consoles have completed yet and if so, they can do a console patch that way.
On a side note, DOITT also have a WAVE system which patches smartphone with radio on the DOITT 700 System
It is quite easy to tell when a user is coming over on WAVE, the audio is quite poor when listening on a scanner when compared to P25 audio but I never hear a radio user complain so I guess it sounds OK on their portable.
That would make complete sense because it was during the fatal crash on the cross Bronx. BC was talking to the PA about checking cameras as they were unsure of the exact location of the crash initially.