no this is not a configurable option. Its easier to just rename the files with a simple shell script

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Valter Nogueira
Sent: Thursday, October 13, 2016 1:53 PM
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Subject: [Freeswitch-users] Changing sound file suffixes

Is possible change sound file suffixes on FS?

I would like to share files that I already use in Asterisk with my FS, like .alaw, instead of .PCMA.

Regards,

Valter