Based on a little sip debugging, these appear to be the supported audio codecs on the Nokia E65
- AMR
- PCMU
- PCMA
- iLBC
- G729
The above is the order they’re presented in, so it’s probably also the order of preference.
Note: These are for VOIP calls only, the media player supports a much broader range of formats.
Update (15 Oct 2007): Nokia have released a simple application called SIP VOIP Settings which now allows you to change the preference order of codecs.