[asterisk-r2] How to configuration for Polarity Reversal for DTMF R2

[Oscar Carriles]

  Generic MFCR2 telco or carrier specs sometimes lacks a complete 
protocol specification.
Register signalling maybe R2 (MF or DTMF) but Line signalling may not 
allways be digital R2 .
While line signalling maybe offerred thru CAS state supervision (AB bits 
pattern changes
or just A bit simulating open/close loop circuit or an e&m variant like 
traditional analog lines).
Ensure you have MFCR2 Register & Line signalling digital E1 in order to 
be able to use
OpenR2.


Oscar Carriles
Eolix Technologies
ocarriles at eolos.la




Piyawit Khumkrong escribió:
> Dear , all expert
> I have a problem with R2(DTMF) connection the solution is 1 port to 
> Telco 1 port to NEC
> so the problem is NEC can't detect answered call to billing system and 
> can't transfer the call from operators
> then NEC engineer said "that is the problem from polarity reversal" 
> can anyone tell me
> how to configuration for polarity reversal in asterisk with Sangoma A102 ?
>
> -- 
> Best regards
>
> ปิยวิทย์ คุ้มครอง (เอส)
> Piyawit Khumkrong (S)
> Technical Department
> AISTelebiz Co.,Ltd
> Tel.(+66)0-2946-1490 Ext.905
> Email:piyawit at aistelebiz.com <mailto:piyawit at aistelebiz.com>
>
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