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<p style="MARGIN: 0cm 0cm 10pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri"><a></a><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">TDM</font></font></span> system
with R2<a></a>(DTMF<a></a>) mode <span style="mso-spacerun: yes"> </span>can used A bit similar state of FXO<a></a> port seizure and answer use same condition close loopback circuit.
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<p style="MARGIN: 0cm 0cm 10pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">Probably you system used A and B and NEC expecting A bit., please ask to NEC engineering to pass CAS setting mode.<o:p></o:p></font></font></span></p>
<p style="MARGIN: 0cm 0cm 10pt" class="MsoNormal"><span style="mso-ansi-language: EN-US" lang="EN-US"><font size="3"><font face="Calibri">Good luck<o:p></o:p></font></font></span></p>
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<div><font size="2" face="Tahoma">Mc GRATH<a></a> Ricardo</font></div>
<div><font size="2" face="tahoma">E-Mail<a></a> <a href="mailto:mcgrathr@mail2web.com">
mcgrathr@mail2web.com</a><a></a></font></div>
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<font color="#000000" size="2" face="Tahoma"><b>From:</b> asterisk-r2-bounces@lists.digium.com [asterisk-r2-bounces@lists.digium.com] On Behalf Of Piyawit Khumkrong [piyawit@aistelebiz.com]<br>
<b>Sent:</b> 08 October 2011 01:24<br>
<b>To:</b> asterisk-r2@lists.digium.com<br>
<b>Subject:</b> Re: [asterisk-r2] How to configuration for Polarity Reversal for DTMF R2<br>
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<div>Dear Moy</div>
<div> </div>
<div>now i ask the NEC technician they can't detect CAS bit only call through VoIP only but Telco work fine</div>
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<div>thanks<br>
<br>
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<div class="gmail_quote">On Fri, Oct 7, 2011 at 9:31 AM, Moises Silva <span dir="ltr">
<<a href="mailto:moises.silva@gmail.com">moises.silva@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
2011/10/6 Piyawit Khumkrong <<a href="mailto:piyawit@aistelebiz.com">piyawit@aistelebiz.com</a>>:<br>
<div>> I have a problem with R2(DTMF) connection the solution is 1 port to Telco 1<br>
> port to NEC<br>
><br>
> so the problem is NEC can't detect answered call to billing system and can't<br>
> transfer the call from operators<br>
><br>
> then NEC engineer said "that is the problem from polarity reversal" can<br>
> anyone tell me<br>
<br>
</div>
Polarity reversal is used in analog lines (FXS lines) to signal<br>
answer, not in CAS systems. In R2, the answer is signaled using CAS<br>
bits and is currently being done. You need to ask your NEC technician<br>
why is their system not able to detect the CAS bit changes that we<br>
send to signal "Answer"<br>
<br>
<br>
Moises Silva<br>
Senior Software Engineer, Software Development Manager<br>
Sangoma Technologies Inc. | 100 Renfrew Drive, Suite 100, Markham ON<br>
L3R 9R6 Canada<br>
t. 1 905 474 1990 x128 | e. <a href="mailto:moy@sangoma.com">moy@sangoma.com</a><br>
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-- <br>
<div>Best regards<br>
<br>
ปิยวิทย์ คุ้มครอง (เอส)<br>
Piyawit Khumkrong (S)<br>
Technical Department<br>
AISTelebiz Co.,Ltd<br>
Tel.(+66)0-2946-1490 Ext.905<br>
<a href="mailto:piyawit@aistelebiz.com">Email:piyawit@aistelebiz.com</a></div>
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