[asterisk-users] RS485 Audio device

Pete Mundy pete at fiberphone.co.nz
Wed Nov 2 14:55:17 CDT 2016

Unless there is already RS485 in place, forcing the use of that type of bus, this sounds to me like something that would be more easily achieved using one of those 2-wire SIP doorphones that puts standard analog audio over a copper pair between the handset and the base.

I don't have any specific model to reference to, but they've definitely been discussed on-list before.


> On 3/11/2016, at 8:46 am, Jerry Geis <jerry.geis at gmail.com> wrote:
> Hi All,
> The reason for the question was simply that the customer desired some solution
> called an "AOR" or Area of refuge - I think it was. Basically a call button, microphone and speaker to hear back
> with the kicker being "a long distance" the solution has to run.  RS485 is like 4000 feet.
> There are solutions our there apparently that are not built on asterisk - so I was just trying to find
> a solution that potentially worked with asterisk. 
> Thanks! 
> Jerry
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