Great example on Full duplex audio support in S60 here:
http://www.developer.nokia.com/info/..._0_en.zip.html
and a nice article
http://www.developer.nokia.com/Commu...l_Duplex_Audio

Could you help clarify the following query? If Full duplex audio is limited to S60 how is Nokia supporting VoIP client on Series 40 phones listed here: http://www.developer.nokia.com/Commu...ies_40_devices

Thank you.