<p>I once setup a callback system for someone and we had these DTMF issues on constant basis, and all the complains were from cell phone users. At that time I found out that even my own cellphone would not DTMF correctly from certain locations, including my home, but would work perfectly fine from my work location. Probably times of the day matters too, but yes, calling from cell phones does result in DTMF issues, and the reason is that it is just the audio signals, which get distorted based on various factors like the signal strength, cell tower transmission quality, transcodings, etc.<br>
</p>
<p>Zeeshan A Zakaria</p>
<p>--<br>
<a href="http://www.ilovetovoip.com">www.ilovetovoip.com</a></p>
<p><blockquote type="cite">On 2010-06-17 11:25 AM, "Alejandro Cabrera Obed" <<a href="mailto:aco1967@gmail.com">aco1967@gmail.com</a>> wrote:<br><br>Danny, so you say it's a problem of the cell phone and not the<br>
Astreisk or GSM Gateway ???<br>
<br>
OK, in this case if I call from a fixed phone (not a cell phone) to<br>
the IVR, the DTMF quality problem will not be present....this may be a<br>
good test, isn't it ??? Or do you suggest another test I can implement<br>
???<br>
<br>
Thanks again<br>
<br>
Alejandro<br>
<br>
2010/6/17 Danny Nicholas <<a href="mailto:danny@debsinc.com">danny@debsinc.com</a>>:<br>
<p><font color="#500050">> The physical location of the phone (access to towers) can vastly affect the<br>> quality of DTMF pass...</font></p><font color="#888888">--<br>
Alejandro Cabrera Obed<br>
<a href="mailto:aco1967@gmail.com">aco1967@gmail.com</a><br>
<a href="http://www.alejandrocabrera.com.ar" target="_blank">www.alejandrocabrera.com.ar</a><br>
</font><p><font color="#500050"><br>-- <br>_____________________________________________________________________<br>-- Bandwidth and Colocati...</font></p></blockquote></p>