Contents of build 2.3.1, release date 04/02/2016:

SIPTP-640: Minor fix to implement 'pure' IP-address based authentication

SIPTP-641: Minor changes to carrier API calls owing to API service changes

SIPTP-593: Minor fix to SIP "From" header issue when generating dial plan

SIPTP-643: Minor fix to how portal messages are displayed when updating emergency addresses

SIPTP-622: Minor improvement to call routing via underlying carriers, better catering for backup and exception routing

SIPTP-633: Minor improvement to prevent non-geographic '03' numbers being used for SMS-enabled mobile accounts (as such numbers are not SMS enabled)

SIPTP-653: Minor improvement to perform check when adding an IP-address authenticated trunk to check if IP address already in use