I am looking at the internet calling options in 2.3-Gingerbread. Does anyone know what codecs this dialer uses? Can the codecs be configured?

1 Answer 1


From a packet capture, the codecs are:

  • GSM-EFR 8Khz
  • AMR 8Khz
  • GSM 8Khz
  • G.711/PCMU 8Khz
  • G.711/PCMA 8Khz

Here's the tidbit from the RTP packet capture:

m=audio 22728 RTP/AVP 96 97 3 0 8 127
a=rtpmap:96 GSM-EFR/8000
a=rtpmap:97 AMR/8000
a=rtpmap:3 GSM/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:127 telephone-event/8000
a=fmtp:127 0-15

I couldn't find a way to configure the codecs either.


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