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<DIV><FONT face=Arial size=2>Ok, I think I figured out the problem</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If both the phone and asterisk are using RFC2833, I
get this DTMF problem. But, If I set both the phone and Asterisk to DTMF=inband,
the DTMF tones sound much better. (I verified the DTMF status of the call by
doing "sip show channel ?" in the CLI)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is there a known problem with RFC2833 in Asterisk?
(Note, this would only happen when Asterisk acts as a SIP endpoint in the Call,
like when a SIP phone calls out through the FXO port not when the call is just
passing through the server).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>There is also a thread about how the XTEN softphone
seems to have a DTMF problem. XTEN says they fixed it, but people (including
myself) still see the problem. I wonder if there is a bug in Asterisk support of
RFC2833? One of the XTEN users says that one way the problem shows up is if you
send a string of DTMF's that are the same number (1001 fails , but 1234 works).
I have seen the same issue on a Cisco phone ascessing VM on an Asterisk
server.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Lee Goodman</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=lee.goodman@comcast.net href="mailto:lee.goodman@comcast.net">Lee
Goodman</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=asterisk-users@lists.digium.com
href="mailto:asterisk-users@lists.digium.com">asterisk-users@lists.digium.com</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, August 12, 2003 4:32
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Asterisk-Users] Weird DTMF
issue</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Can anyone explain why this is
happening?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have a server attached to a phone line that
will play a .wav file, then play all the dtmf digits (after it answers the
call). If I place a call from a SIP device (like a Cisco 7960 phone) through
Asterisk and on to the test server, via PSTN, the .wav file sounds fine, but
the DTMF digits are distorted</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial
size=2>----->------------->--------------------audio in this direction
------>-------------------->--------------------></FONT></DIV>
<DIV><FONT face=Arial size=2>[test server that plays .wav file then DTMF
digits] -----PSTN-------[Asterisk]-----SIP----[Cisco 7960]</FONT></DIV>
<DIV><FONT face=Arial size=2>----<------------------------------------call
setup in this direction ---------<---------------<
---------------<</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The Asterisk is set for DTMF=inband , codec
g711ulaw</FONT></DIV></BLOCKQUOTE></BODY></HTML>