Have you confirmed for sure that having it start at zero is the whole problem?<br><br><br><div class="gmail_quote">2008/6/30 UV <<a href="mailto:uv@talknet.com.au">uv@talknet.com.au</a>>:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I thought of moving this thread over here.</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">We're trying to make the FS work with MS Exchange 2007
(in a non-RFC4733-compliant mode). For this to work, we need to get the
Duration count start from 0 instead of starting from 160 (or any other sample
rate).</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">We assume these are the lines needed to be changed:</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">From /src/switch_rtp.c</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">1042
rtp_session->dtmf_data.out_digit_sofar = samples; </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">1043
rtp_session->dtmf_data.out_digit_sub_sofar = samples; </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">To /src/switch_rtp.c</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">1042
rtp_session->dtmf_data.out_digit_sofar = 0; </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">1043
rtp_session->dtmf_data.out_digit_sub_sofar = 0; </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Are we missing anything? Are we breaking anything? (except compliancy)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">-----Original Message-----<br>
From: <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>
[mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>] On Behalf Of UV<br>
Sent: Sunday, June 29, 2008 7:45 PM<br>
To: <a href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.freeswitch.org</a><br>
Subject: Re: [Freeswitch-users] Exchange 2007 UM - DTMF problem</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Apparently, not only MS do not comply with RFC4733 but also
SJphone, Xlite (eyebeam) and Cisco (Call manager, IP phones, etc) amongst
others.</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Is there anyway I can make FS's Duration to start from 0?
I'm happy to change the code myself with a little guidance.</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">-----Original Message-----</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">From: <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a></span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">[mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>] On Behalf Of
Steve</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Underwood</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Sent: Sunday, June 29, 2008 3:42 PM</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">To: <a href="mailto:freeswitch-users@lists.freeswitch.org" target="_blank">freeswitch-users@lists.freeswitch.org</a></span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Subject: Re: [Freeswitch-users] Exchange 2007 UM - DTMF problem</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Hi,</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Brian West wrote:</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> So if you can tell me where this is wrong as per 2833 and
the </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> clarification via 4733 ?</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> rfc4733 obsoletes rfc2833 and says this:</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> The special duration value of zero is
reserved to indicate that the</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> event lasts "forever", i.e., is
a state and is considered to be</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> effective until updated. A sender
MUST NOT transmit a zero duration</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> for events other than those defined as
states. The receiver SHOULD</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> ignore an event report with zero duration
if the event is not a</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> state.</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> /b</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> PS: <a href="http://www.rfc-editor.org/rfc/rfc4733.txt" target="_blank">http://www.rfc-editor.org/rfc/rfc4733.txt</a></span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">As well as that definition in RFC4733, they also have an example
working </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">in the way the text describes. They send DTMF with a packet rate of one
</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">every 50ms. The first packet of the DTMF sequence contains a duration
of </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">400.</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">What does FS actually do when a sequence starts at 0? Does it just drop
</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">the first packet, or the whole sequence? If it just drops the first </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">packet, and the far end cares, that's seriously broken on their part.
It </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">means a single lost packet screws up the whole sequence. Not good. If
FS </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">drops the whole sequence, that might be a little too aggressive.</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Some will argue that a gateway should be totally transparent in these </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">situations, but total transparency is only workable in simplistic
cases.</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">In the end, if MS are doing this you can be sure it will not be fixed, </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">and must be tolerated.</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Regards,</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;">Steve</span></font></p>
<p><font face="Courier New" size="2"><span style="font-size: 10pt;"> </span></font></p>
<p><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; color: black;"> </span></font></p>
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