Hi, Proceeding further from the idea I obtained in this user group, to use pulse audio to manage sound, by setting PULSE_SOURCE and PULSE_SINK with source and sink of the sound card I want to use, I ve come to point where SIP stack produces buffer overrun/underrun errors while opening the sound card "default" or "pulse". The solution to it, is end all activity on that sound card, close it and open it again. Any heads on how to deal with this problem ?? -- Thank you... Amar Akshat (????) "Walking on water and developing software from a specification are easy if both are frozen."