[Freeswitch-users] Different music for Hold and Transfer (internal SIP-functions)

I am using some regular sip-phones and the internal sip-functions for HOLD and TRANSFER. I do NOT use the applications “transfer/att_xfer” and “soft_hold”. The phone is a “Siemens OpenStage 60 G”, but this fact should not be important. My problem is now that I can’t have different music for transfer and hold. If I would use the freeswitch-applications “transfer/att_xfer” and “soft_hold” then I would be able to set the variables “hold_music” and “temp_hold_music”. Any idea to achieve this?