The best replacement for mitel is cisco.

The best alternatives to mitel are rated as following:
★★★★★  cisco
★★★★★  shoretel
★★★★  avaya
★★★  nec
★★  asterisk
★★  nortel
★  allworx
★  digium
★  3cx
★  aastra
★  cisco voip
★  zultys
★  alcatel
  inter tel
  polycom

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Google Trends

Scale is based on the average worldwide traffic of mitel in all years. Click on graph for more.
mitel
cisco
shoretel