asterisk users - May 2004 - Save voice data from IAX. Is that posible?

Hello all,

Can anyone help me out in this situation?
I am trying to find out the cause of a one-way audio that occurs after 
some period in the work of my asterisk system.
I would be great to listen  Voice data transmitted via IAX for codecs 
(g711, g723, gsm or g729).
Is that possible?
And if yes, then how can I do that?

-- 
Best regards,
	Alexey Ostrovsky