3Com 3101SP BASIC SPKR-PHONES IN SIP Mode 1

[MitelAU]

We have a customer that has a heap of 3Com 3101SP BASIC SPKR-PHONES and would like to connect them to a Mitel system in SIP mode.
I understand that the handset downloads its SIP firmware during the bootup phase.
I am trying to source the fireware so I can load it to an external TFTP server but have been unsuccessful thus far.
Can anyone please lead me in the right direction.

Appreciate your help.

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[engjohn]

It requires a proprietary service from 3Com to download the firmware.
They do have versions that run on Linux (Asterisk deivice modified by 3Com, and their VCX line of servers.) but good luck getting that to run on anything else...