The best replacement for 323 is sip.

The best alternatives to 323 are rated as following:
★★★★★  sip
★★★★  325
★★★  310
★★★  328
★★★  mgcp
★  dns-325
★  dns 320
★  320
★  dns 321
  h 320
  626
  .318
  readynas duo
  321

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323
sip
325