asterisk users - Mar 2003 - ${RDNIS} Variables Question

Can anybody explain the ${RDNIS} variable purpose and usage.
 
 
Many thanks
 
 
Adrian Brown
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On Fri, 2003-03-21 at 17:02, Adrian Brown wrote:
> Can anybody explain the ${RDNIS} variable purpose and usage.
>  
> 
> Many thanks

DNIS: Dialed Number Information Service.
What number the caller dialed. Used when multiple numbers point to the
same line, or group of lines.

I'm pretty sure of what is below.

RDNIS: Reverse Dialed Number Information Service 
Essentially Caller ID, maybe not as susceptable to being changed though
as I think it is transmitted in PRI signalling not as FSK on the line.
Essentially to modify it, the caller would have to be able to convince
the telco to send something different.

Usage: Could be used to take callers from a specific trunk
group(specific customer) and route differently avoiding certain prompts,
or add certain prompts.

 
-- 
Steven Critchfield  <critch@basesys.com>

> RDNIS: Reverse Dialed Number Information Service
> Essentially Caller ID, maybe not as susceptable to being changed though
> as I think it is transmitted in PRI signalling not as FSK on the line.
> Essentially to modify it, the caller would have to be able to convince
> the telco to send something different.
Actually this is "Referring" DNIS and is the number (if applicable)
which
forwarded the current call to you.

Mark