6.1.7 Can 6900 phones be used with any Call Manager?
No. The 6900 firmware is locked so that it will only work with Mitel platforms. If a user attempts to
configure and connect to a third-party server (e.g. Broadsoft) then the SIP accounts will not register.
Page | 7 R5.0 SIP 6900/6800 FAQ
6.1.8 Are 6800 phones locked if we install R5.0 or still open to all Call Managers?
The 6800 series phones are sold into Open Standards market (Broadsoft, Asterisk etc.) as well as behind
Mitel solutions (MX-ONE, 5000, 400, Telepo, etc.). They will continue to be open and R5.0 does not lock
them to Mitel platforms.