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

[Piyawit Khumkrong]

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> wrote:

> 2011/10/6 Piyawit Khumkrong <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
>
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-- 
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 <piyawit at aistelebiz.com>
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