No Caller ID on forwarded calls

[gustaf08]

My company has been with nextel since about 1998. We have a separate service that forwards incoming landline calls to our company office to the cell phones of various employees. Up until about 4 months ago, the caller ID would work on those forwarded calls and display the number on our cell phones (i870's and i710's). Then the caller ID stopped working and all we got was a "incoming call" or "line1" message. Talked to CS at Nextel for several months, finally got answer that "caller Id just won't work with your scenario". Called a friend who works for Sprint/Nextel, and voila, caller ID started working within several days. A Lady from Corporate called to make sure everything was okay and we said yes. She Said call her back if any more problems. Worked great for about a month, then I called CS to inquire about adding a 2nd line to my phone. When I asked if having 2 lines on my phone would affect the Caller ID, the agent said maybe. I thus declined to pursue the adding of the 2nd line. And amazingly the caller ID problem immediately started up again on all our phones! Since then we have spent hours on the phone with CS and with the lady from corporate on conference and have been unable to get the problem resolved "again". Now I have bought a 2nd phone (i880) (with a new phone # and new SIM card) and the caller ID WORKS on calls forwarded to that new phone. My partner then bought a new i880 to replace his i870 (same # but new SIM Card), but caller ID does NOT work with his new set-up. At this point it appears that there is some type of a problem with the routing of our calls through Nextel to the older phone #'s. Is there an "old" way and a "new" way that calls are routed for older vs newer #'s with Nextel? Like through a different bank of computers with different versions of software? We are ready to drop Nextel and go to a carrier that can figure out how to get the caller id to work on our incoming "forwarded calls". Sorry to say that sincce we really like the PTT, but hey if we can't see where incoming calls are originating then we can't continue.