Music On Hold AAC Codec

Hi,
How can i capture live radio stream with AAC Codec? I am able to capture mp3 radio stream with mpg123 using below example.

/usr/bin mpg123 -q -s --mono -r 8000 -f 8192 -b 0 »streaming.siue.edu:8000

Thank you in advance.

/usr/bin/ffmpeg -i streaming.siue.edu:8000 -ar 8000 -ac 1 -acodec pcm_s16le -f s16le -af volume=0.5 pipe:1