The firmware can be changed in the BlueGate ISDN Brave - use setting program and USB cable.
V220.127.116.11 - new (17.6.2014)
V18.104.22.168 - new (10.3.2014)
V22.214.171.124 - new function CallBack - with add possibility to save connected calls shorter than 0 - 60 seconds for smart callback (29.10.2012)
V126.96.36.199 - fixed problem with ringtone after DISA and added some PBX and SIM alarms (13.10.2012)