I agree there is much about the system I like, even though I was never a big fan of Norstar or Vantage systems but that had more to do with programming overlay rather than reliability.
I don't like it but accept that we are faced with continual updates and patching but the vendor hasn't changed their mindset regarding servicing this product. They are playing dumb bunny on repairs and reinventing the wheel on known issues at each site. Echo was addressed on SU 6 or 7, but each site requires 3 or more repair calls on a newly installed system and only with a frustrated escalation are systems patched. By then, the client has lost confidence in us and the product.
To Nortel's credit, we have raised at least three issues that were corrected on subsequent service updates. But Nortel is a 1000 miles away and my client is armed and in my face.
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