Can't translate G729 to wav

I’ve tried using netmonitor to record calls in g729 but it won’t merge two files and the only way to save them is in .g729 which is quite bizzare format for casual players. I bought some licences but that didn’t solve the problem. I also can’t convert the files using convert applicaton in CLI because it says there is no such format as g720. Could someone please advice me on how to tackle this problem ? I want to have my call recorded in a wav or mp3 file with both channels merged.

Why don’t you try using mixmonitor ?