All of the previous N-series phone has the capability of allowing users to play media files while calling. This is a great feature as you can quickly share a portion of a song or a voice recording of your kid with a family member or a friend who's talking to you on the other line. It's a great way to share a new song with your gf while you are half-way-around-the-globe calling her on Skype and both parties can listen to it at the same time while discussing about how great the song is.

I am sure there must be a way to add this great feature to our great N-900 phone. I hope our Maemo community will help make this happens! Thank you in advance for your support of this suggestion and for those who will work to make it happen!

Here is the thread that discusses this topic:
PLAY MUSIC WHILE CALLING on N900