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<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello,<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I just wanted to comment and ask for advice on how to fix a
DTMF recognition problem that apparently has been affecting asterisk users for
a long time now.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Duplicate digits are detected by Asterisk specifically when
using out of band tone recognition. <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I've done extensive testing with detailed debug traces with
one of our partner providers. The scenario is the following:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- RFC2833 standard configured on both end-points.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- RFC2833 functionality has been confirmed receiving the
traditional 6 packets per DTFM RTP Event: 3 for the Event Start and 3 for the Event
End. This has been done using tethereal in one end and ethereal in the other
(tethereal on the Asterisk server where only CLI has been installed).<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The test consisted on the 2 following types of calls:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>1) Call from analog headset in the following way:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- Scheme:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Provider (RFC2833) => SIP => Asterisk Server (RFC
2833)<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- Diagnostic: <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> * Correct amount of RTP Event Packets.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> * Additional Payload RTP Event Packets
seen.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> * Duplicate recognition, wrong number. <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>2) Call from analog headset pressing the MUTE button under
the same scenario:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>- Diagnostic:<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> * Correct amount of RTP Event Packets.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> * No Payload Packets around RTP Event
Packets.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> * Correct Number recognition.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>After asking for advice from Asterisk users, I was told
Asterisk doesn't seem to stop performing in-band DTMF tone recognition while
doing out of band.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Consequences: <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This represents a big problem in our environment where IVR
development is essential and where we work with different providers that deliver
different levels of audio, meaning that one with an increased level with tend
to produce on Asterisk duplicate tone recognition if set to a an out of band
method.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We'll greatly appreciate the advice, new services’
release is being held up because of this fault.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks in advance for your support.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Comments on this type of problem can be seen in this bug
report:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a href="http://bugs.digium.com/view.php?id=5970"
title="http://bugs.digium.com/view.php?id=5970">http://bugs.digium.com/view.php?id=5970</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName ProductID="Max Glucksmann" w:st="on"><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Max Glucksmann</span></font></st1:PersonName><o:p></o:p></p>
<p class=MsoNormal><U1:PERSONNAME ProductID="Max Glucksmann" u2:st="on"><font
size=1 color=navy face=Arial><span style='font-size:8.0pt;font-family:Arial;
color:navy'></U1:PERSONNAME>e-mail: <a
href="mailto:mglucksmann@comtel-networks.com"
title="mailto:mglucksmann@comtel-networks.com"><span
title="mailto:mglucksmann@comtel-networks.com">mglucksmann@comtel-networks.com</span></a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Web: <a
href="http://www.comtel-networks.com/" title="http://www.comtel-networks.com/">http://www.comtel-networks.com</a></span></font><font
size=1 color=navy><span style='font-size:8.0pt;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'>Venezuela<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'>Teléfono: (0500) MAXITEL
– ext. 1011001<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'>Fax: (0212) 953-0769</span></font><font
color=navy><span lang=ES-VE style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'>USA<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Phone</span></font><font size=1 color=navy
face=Arial><span lang=ES-VE style='font-size:8.0pt;font-family:Arial;
color:navy'>: 1 (877) 467-2877 – ext. 1011001<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'>Fax: (954) 671-6800</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=ES-VE
style='font-size:8.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Comtel Networks, Corp. - Proprietary and
Confidential</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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