I think there is raw audio in file. I am following this link as reference. 

https://superuser.com/questions/670561/what-is-the-ffmpeg-command-to-convert-3gp-to-ulaw

On 23 October 2017 at 01:02, Abaci B <abaci64@gmail.com> wrote:

FreeSWITCH would covert the file to raw audio and then re-encode it to PCMU if that's what's negotiated for the call, the only way to eliminate that is to use mod_native_file and make the file a raw PCMU file (song.PCMU)

On Sun, Oct 22, 2017 at 7:35 PM, Aqs Younas <aqsyounas@gmail.com> wrote:

Greetings list,

Just want to confirm will trancoding happen while playing a file having format as below. 

root@debian:/opt/tmp# soxi song.wav

Input File     : 'song.wav'

Channels       : 1

Sample Rate    : 8000

Precision      : 14-bit

Duration       : 00:00:55.05 = 440436 samples ~ 4129.09 CDDA sectors

File Size      : 441k

Bit Rate       : 64.0k

Sample Encoding: 8-bit u-law

If i get PCMU as only codec in invite.

Here .wav is just a container wrapping PCMU audio. 

Best Regards, 

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