The best replacement for ip telephony is voip.

The best alternatives to ip telephony are rated as following:
★★★★★  voip
★★★  pbx
★★  tdm
★  pabx
★  traditional telephony
★  avaya
  voice over ip

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Google Trends

Scale is based on the average worldwide traffic of ip telephony in all years. Click on graph for more.
ip telephony
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pbx