The best replacement for speex is gsm.

The best alternatives to speex are rated as following:
★★★★★  gsm
★★★  g729
★★★  opus
★★★  celt
★★★  nellymoser
★★★  ilbc
★★  aac lc
★★  vorbis
★  amr
★  ulaw
★  g722
  pcmu
  webrtc
  alaw

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Google Trends

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speex
gsm
g729