ActivateLoudspeaker failes on E51

Hi,

I am using APS server to toggle between loudspeaker and handset during a call.

RAPSSession tSession;
tSession.Connect();
TAPSInitSettings iPSettings;
iPSettings.iSettings.iCaps = TMdaAudioDataSettings::ERoutingControl;
iPSettings.iSettings.iFlags = 0; // CAudioOutput::ENoPreference;
tSession.InitializePlayer(iPSettings);
tSession.ActivateLoudspeaker(ETrue);
tSession.Close();

This approach works fine in S60 3rd Edition,MR ,where as fails on S60 3rd Edition, Feature Pack 1 phones.