VOIP for stored audio files

Hi all,

Can you suggest any open-source software which supports VOIP on beagle
board an Angstrom or ubuntu OS,
I have tried with Ekiga, but it gives segmentation error when i open
it, more over it doesnt support transfer of stored audio via VOIP. I
have evn tried with aMSN, but it supports transfer of files via FTP.

I need some software which will support stored audio transfer via

Kindly oblige.