For disk space purposes, use ‘sox’ and transcode your recordings overnight to single-channel 8Mhz mp3 files. You can also do this in the advanced settings on your SIP registrations (somewhere), but I recommend doing it after business hours to save your CPU power.
Thank You @tonyclewis & @cynjut !!! I am using Asternic Call Stats now so what I have been doing is using LAME MP3 converter to convert the .WAV call recordings in var/spool/asterisk/monitor to .mp3 files when moved to the Asternic side of things. The next morning I just go in and delete the .WAV files in var/spool/asterisk/monitor and that seems to be working.