I've rebuilded the linphone application on my Ubuntu 10.10:
/linphone-3.4.0/console$ ./linphonec
ortp-error-Could not find a suitable soundcard !
May be related to this:
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: omap3beagle [omap3beagle], device 0: TWL4030 twl4030-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
aplay -L
null
Discard all samples (playback) or generate zero samples (capture)