What codecs is whistle using?

lovemywhistle's Avatar


19 May, 2010 09:18 PM

I am wondering that codecs whistle uses in different situations:

  1. With generic SIP account. What is the preferred codec list for whistle phone? I am especially interested in what kind of codecs whistle use over 3G. A low bandwidth codec certainly helps with voice quality.
  2. With whistle account. What is the protocol whistle phone use to talk to the whistle servers? I assume the server will convert the call to the PTSN. So what matters is the codec between the whistle phone and whistle server.

Thanks for listening. Hope you can make this a huge success!

  1. 1 Posted by Whistle Guru on 21 May, 2010 05:05 PM

    Whistle Guru's Avatar

    Sorry for the delay,

    We use the following codecs

    iLBC (select platforms), G.711 u-law and G.711 a-law.

  2. 2 Posted by lovemywhistle on 21 May, 2010 05:23 PM

    lovemywhistle's Avatar

    Thanks for the message. Is iLBC included in the iPhone software? Does it have a higher priority than the other two?

  3. 3 Posted by Whistle Guru on 21 May, 2010 05:56 PM

    Whistle Guru's Avatar

    iLBC is only used on our Mac and Windows clients.

  4. 4 Posted by lovemywhistle on 21 May, 2010 06:14 PM

    lovemywhistle's Avatar

    Really? That is too bad. iLBC's advantage is bandwidth efficiency. So it might be better used with iPhone. But thanks for your info anyhow.

  5. Whistle Guru closed this discussion on 21 May, 2010 07:57 PM.

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