[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



Mc GRATH Ricardo escribio':
>
> TDM system with R2(DTMF) mode can used A bit similar state of FXO port 
> seizure and answer use same condition close loopback circuit.
>
> Probably you system used A and B and NEC expecting A bit., please ask 
> to NEC engineering to pass CAS setting mode.
>
> Good luck
>
> Mc GRATH Ricardo
> E-Mail mcgrathr at mail2web.com <mailto:mcgrathr at mail2web.com>
> ------------------------------------------------------------------------
> *From:* asterisk-r2-bounces at lists.digium.com 
> [asterisk-r2-bounces at lists.digium.com] On Behalf Of Piyawit Khumkrong 
> [piyawit at aistelebiz.com]
> *Sent:* 08 October 2011 01:24
> *To:* asterisk-r2 at lists.digium.com
> *Subject:* Re: [asterisk-r2] How to configuration for Polarity 
> Reversal for DTMF R2
>
> Dear Moy
> now i ask the NEC technician they can't detect CAS bit only call 
> through VoIP only but Telco work fine
> thanks
>
> On Fri, Oct 7, 2011 at 9:31 AM, Moises Silva <moises.silva at gmail.com 
> <mailto:moises.silva at gmail.com>> wrote:
>
>     2011/10/6 Piyawit Khumkrong <piyawit at aistelebiz.com
>     <mailto:piyawit at aistelebiz.com>>:
>     > 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
>
>     Polarity reversal is used in analog lines (FXS lines) to signal
>     answer, not in CAS systems. In R2, the answer is signaled using CAS
>     bits and is currently being done. You need to ask your NEC technician
>     why is their system not able to detect the CAS bit changes that we
>     send to signal "Answer"
>
>
>     Moises Silva
>     Senior Software Engineer, Software Development Manager
>     Sangoma Technologies Inc. | 100 Renfrew Drive, Suite 100, Markham ON
>     L3R 9R6 Canada
>     t. 1 905 474 1990 x128 | e. moy at sangoma.com <mailto:moy at sangoma.com>
>
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> Best regards
>
> »ÔÂÇÔ·Âì ¤ØéÁ¤Ãͧ (àÍÊ)
> 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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