Published Date: 01 June 2019

To install a new firmware version on a base station and/or handset, please follow the instructions provided in the firmware update guide.


  • after upgrading to version 450BXX the rollback to version 410Bxx or previous is not possible
  • please read carefully the release notes before upgrading, some major known issue are present
  • after the base upgrade to 450B08 also handsets must be upgraded to the version 450B05


  • DECT-632: Wrong SIP request URI in Record-Route (strict routing) scenario. This issue is breaking compatibility with 3CX SBC (and other SBCs that require strict routing)
  • DECT-629: No audio after hold INVITE or reINVITE

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