EPM Provisioning Cisco SPA Phones with G722

Does anybody know if it’s possible to provision codecs on Cisco SPA508G phones? We’d like to turn on support for G722. It can be done from the phone or from the XML using the following lines.

<Preferred_Codec_1_ group="Ext_1/Audio_Configuration">G722</Preferred_Codec_1_>
<Use_Pref_Codec_Only_1_ group="Ext_1/Audio_Configuration">No</Use_Pref_Codec_Only_1_>
<Second_Preferred_Codec_1_ group="Ext_1/Audio_Configuration">G711u</Second_Preferred_Codec_1_>
<Third_Preferred_Codec_1_ group="Ext_1/Audio_Configuration">Unspecified</Third_Preferred_Codec_1_>