Since first posting about availability of the new Aastra MBU-400 SIP/DECT system I’ve seen considerable interest in the device, but no-one stepping up with any first hand experience with its use. The device is in fact vaguely related to the snom m3 SIP/DECT systems that I own and enjoy using. Both are based upon reference designs from RTX Telecom.
As an OEM product from RTX Telecom the hardware design is largely fixed, but Aastra has a lot of control over the firmware. I know that snom has made considerable progress with firmware enhancements for the m3 since it was introduced to the US about a year ago.