ADP hasn't been a proprietary feature for several years now; all major vendors now offer it in their P25 subscribers.
Oh and far be it for me to defend MSI, but the whole "they sold the customer..." thing is a bit old. The plain fact is that plenty of customers know exactly what they're doing when they spec these systems, and part of the little game a lot of agencies play is to put wording in the RFP/bid language that purposely include exclusive/proprietary technology so that they can basically automatically exclude other vendors. The fire service has been playing that game for decades in order to get exactly the brand of apparatus they want. You know, like how we made sure to spec "independent front suspension and fly-by-wire controls" for our tower ladder back in 2001 because Pierce was the only manufacturer that offered it at the time.
Please stop with the silly narrative that the customers are so naive and don't know what they're getting into, and that MSI's sales team is so clever as to pull the wool over the eyes of thousands of customers over the years. Yes, a small percentage might be gullible, but the majority are not.
Ding ding. I oversee a ton of radios for multiple agencies. All different mfg/models (P25 Phase 1 trunked) I had the fortune of being PM on recent deployment (~ 2800 radios) ALL APX's (And include a useful option. See #5). Why? (Multiple reasons)
1-Moto builds good boxes
2-Prefered contract pricing.
3-Single mfg/neck to choke
4- Other misc reasons/Etc
5- And a non P25 feature "Group Services". (This feature allows radios to display radio aliases as identified in PM. Users can make name changes, those changes are updated in PM, and all field radios now see updated alias. (After one PTT). No radio programming required. I am not aware of any other mfg to offer this capability. (And yes it has to be on a Moto Trunked system from my research. Maybe of system mfg offer same capability. But the 2 state systems I work with are Moto)
As a database mgr, this is a god send! Radios are moved to new vehicle #'s, radios are assigned to different officers, etc. As long as I am notified, 2800+ radio alias's are updated and accurate. And all APX's see updated alias.
Is anyone telling these users (or me!) not to have this feature because it is NOT in P25 standards? Good luck.