<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><div> </div><div>thanks<br><br></div><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" target="_blank">moises.silva@gmail.com</a>></span> wrote:<br>
<blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote">2011/10/6 Piyawit Khumkrong <<a href="mailto:piyawit@aistelebiz.com" target="_blank">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" target="_blank">moy@sangoma.com</a><br>
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»ÔÂÇÔ·Âì ¤ØéÁ¤Ãͧ (àÍÊ)<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" target="_blank">Email:piyawit@aistelebiz.com</a></div>
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