How to playback ilbc files?

i use asterisk 11.5.1 on my raspberry pi for an outdoor project, cpu power is an issue. i record phone calls (with ilbc codec) with “MixMonitor” in files with the extention xxx.ilbc

this files, i want to play back with “ControlPlayback” but it wont work with ilbc codec, with gsm its working.

does anybody know an application that could handle ilbc files for playback?