Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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?

share|improve this question
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.

share|improve this answer
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 documentation. – Vlastimil Ovčáčík Aug 23 '15 at 16:19

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.