Decode Audio from captured IAX2 packets?

Hi everyone,

i have captured a conversation via IAX2 protocol with ethereal. is it somehow possible to decode the audio thats in the payload of the packets to an audiofile? i know that ethereal can do this with sip-packets. but since there is no specific function to handle iax-packets, maybe there is some other tool or solution to achieve this.

Any help on this is much appreciated. Thx jester