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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?

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up vote 11 down vote accepted

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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Awesome. I never thought of using packet capture. – sickgemini Mar 4 '11 at 1:00
    
This is also true for Android 5.0 Lollipop - supported by my own testing and android.net.rtp.AudioCodec documentation. – Vlastimil Ovčáčík Aug 23 '15 at 16:19

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