Changes since: Audio Server v2 2.5.1.5
NEW - Added Skype TX custom handset codec support (48k 16bit Mono)
FIX - FATAL: Audio server fatal when telco call is added from time to time
FIX - Prevent deletion of ringing tone file in purge routine
FIX - Ringing tone not being included in AS2 installer
FIX - Incorrect reference to PhoneBOX Common causing issues in softphone
FIX - Early clock iterations occurring in device stream
FIX - Decoded call audio buffer overrun messages appearing semi-frequently
FIX - Use UTC for device stream clock to avoid summer time clock change issues
