Steve,<br><br>I'm pretty sure we don't drop anything. We more or less try to SEND with a policy as close to the RFC we can.<br>on RECV, we pretty much allow for as many mistakes as possible within reason.<br><br>The big issue tends to come from situations where we are being a b2bua and passing through audio and dtmf. <br>
We have various settings in the system to choose to pass the RFCXXXX packets transparently or to parse them as they are encountered depending on the situation.<br><br>Also setting proxy_media=true will turn on full transparent proxy mode which will most likely work as well.<br>
<br>UV,<br><br>Matt, (hmmhesays on irc) was doing a lot of playing around with this so he would be a good guy to ask.<br><br><br><br><div class="gmail_quote">On Sun, Jun 29, 2008 at 4:44 AM, UV <<a href="mailto:uv@talknet.com.au">uv@talknet.com.au</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Apparently, not only MS do not comply with RFC4733 but also SJphone, Xlite<br>
(eyebeam) and Cisco (Call manager, IP phones, etc) amongst others.<br>
<br>
Is there anyway I can make FS's Duration to start from 0? I'm happy to<br>
change the code myself with a little guidance.<br>
<div class="Ih2E3d"><br>
-----Original Message-----<br>
From: <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org">freeswitch-users-bounces@lists.freeswitch.org</a><br>
</div><div class="Ih2E3d">[mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org">freeswitch-users-bounces@lists.freeswitch.org</a>] On Behalf Of Steve<br>
Underwood<br>
Sent: Sunday, June 29, 2008 3:42 PM<br>
To: <a href="mailto:freeswitch-users@lists.freeswitch.org">freeswitch-users@lists.freeswitch.org</a><br>
Subject: Re: [Freeswitch-users] Exchange 2007 UM - DTMF problem<br>
<br>
</div><div><div></div><div class="Wj3C7c">Hi,<br>
<br>
Brian West wrote:<br>
> So if you can tell me where this is wrong as per 2833 and the<br>
> clarification via 4733 ?<br>
><br>
> rfc4733 obsoletes rfc2833 and says this:<br>
> The special duration value of zero is reserved to indicate that the<br>
> event lasts "forever", i.e., is a state and is considered to be<br>
> effective until updated. A sender MUST NOT transmit a zero duration<br>
> for events other than those defined as states. The receiver SHOULD<br>
> ignore an event report with zero duration if the event is not a<br>
> state.<br>
> /b<br>
> PS: <a href="http://www.rfc-editor.org/rfc/rfc4733.txt" target="_blank">http://www.rfc-editor.org/rfc/rfc4733.txt</a><br>
><br>
As well as that definition in RFC4733, they also have an example working<br>
in the way the text describes. They send DTMF with a packet rate of one<br>
every 50ms. The first packet of the DTMF sequence contains a duration of<br>
400.<br>
<br>
What does FS actually do when a sequence starts at 0? Does it just drop<br>
the first packet, or the whole sequence? If it just drops the first<br>
packet, and the far end cares, that's seriously broken on their part. It<br>
means a single lost packet screws up the whole sequence. Not good. If FS<br>
drops the whole sequence, that might be a little too aggressive.<br>
<br>
Some will argue that a gateway should be totally transparent in these<br>
situations, but total transparency is only workable in simplistic cases.<br>
<br>
In the end, if MS are doing this you can be sure it will not be fixed,<br>
and must be tolerated.<br>
<br>
Regards,<br>
Steve<br>
<br>
<br>
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