20.x Firmware
20.05 - 16.12.2020
* changed if ISDN port is blocked, calls are rejected with cause 44 now
* disabled PRACK support by default, if not explicitly enabled via experimental option enable_prack
* added allowing schedule of graceful activate/reboot when no calls are affected
* added support for callgroups
* added option max_simultaneous call for SIP groups
* added improved network troubleshooting
* added support for SNMPv3
* added config option t38_ignore_offer
* added contact_all_setting allowing to modify registration contact header
* added monitored_sip_peer option to allow shutting down ISDN ports when SIP peer goes down
* fixed issues during factory reset
* fixed showing used ISDN channel in CDR when call was rejected directly after SETUP
* fixed backup/restore of hostname
* fixed not accepting bye from caller in early dialog on SIP to SIP calls
* fixed issues with GSM table not loading
* fixed not setting contact in validating OPTIONS packets, when validating without registration
* fixed dnssrv request for peers configured with TLS
* fixed GSM/LTE unicode converter
* fixed restoring NTP host from backup
* fixed not using configured dtmflen value, when rfc2833_passthrough=0
* fixed memory leak when using validate without registration
* fixed handling of an re-invite not containing SDP
* fixed sending out rfc2833 events when dtmfmode=inband was used
* fixed not refreshing DHCP anymore when request failed
* fixed problem adding some network routes
* several GUI fixes and improvements
* GUI allowing multiple selection and deletion of SIP groups
* GUI fixed dialplan javascript delete issue
* GUI added from_display and other variables to list of selectable SIP settings
* GUI added cancel button to Full-Trace
* GUI added additional options for managing Full-Trace
* GUI added ajax refresh for active calls
20.04.01 - 13.08.2020
- fixed problem resetting the GUI password
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