<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am still receiving reports from some users that calls they make or receive contain loud deafening beeps that can last a couple of seconds. I understand this is DTMF talkoff and is being triggered because the phone interprets speech as a key press (say if someone is pressing 1 at an IVR). Asterisk triggers DTMF emulation when the talkoff duration is less than 80ms, and I have found a variable in channel.c that I *<b>think</b>* I need to change to make it more tolerant, but it looks like I’ll need to recompile the whole platform from source for it to take effect (how would I do that given I’m using a prepackaged FreepBX distro?)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We are using an FreePBX Asterisk phone system with both SIP in and SIP out trunks for connectivity. My question is how do people running SIP phone systems mitigate against this? I understand Asterisk SIP implementations can be fairly prone to things such as DTMF talkoff. It’s very annoying for the end users.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have tried a variety of different settings on the phones (Cisco SPA512G), including InBand/OutBand etc, such as the following but without any success – the users keep reporting the same problem.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-GB'><img width=239 height=58 id="Picture_x0020_3" src="cid:image001.jpg@01D101ED.083C1FD0"></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-GB'><img width=238 height=59 id="Picture_x0020_4" src="cid:image002.jpg@01D101ED.083C1FD0"></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-GB'><img width=225 height=59 id="Picture_x0020_5" src="cid:image004.jpg@01D101ED.083C1FD0"></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='mso-fareast-language:EN-GB'><img width=228 height=57 id="Picture_x0020_6" src="cid:image009.png@01D101EC.6D38BE80"></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cisco’s InBand/OutBand DTMF implementation/setting doesn’t seem the clearest compared to other phones I’ve deployed…<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>As always, thoughts appreciated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Jamie <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>