My thoughts are to use PBX in a Flash (PIAF) to complete the job. This is all assuming that you will be using the linux box only for this application. Also be advised that PIAF is free and opensource and can be downloaded, if you gogle PIAF, in an ISO format. It will create a bootable CD to which you can install. I would need you to do this remotely or send me you unit to complete the job.
Dane Olson