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<DIV dir=ltr align=left><SPAN class=030223612-24012006><FONT face=Arial
color=#0000ff size=2>Paul,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=030223612-24012006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=030223612-24012006><FONT face=Arial
color=#0000ff size=2>In QSIG, which is essentially a symmetrical variant of
Q.931, T310 is stopped on receipt of a PROGRESS message with progress indication
1 or 8. This behaviour is useful for a number of supplementary services where
expiry of T310 could terminate the call attempt too soon.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=030223612-24012006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=030223612-24012006><FONT face=Arial
color=#0000ff size=2>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=030223612-24012006><FONT face=Arial
color=#0000ff size=2>Ernst</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=de dir=ltr align=left>
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<FONT face=Tahoma size=2><B>From:</B> Paul E. Jones
[mailto:paulej@PACKETIZER.COM] <BR><B>Sent:</B> Monday, January 23, 2006 11:51
PM<BR><B>To:</B> itu-sg16@external.cisco.com<BR><B>Subject:</B> T310 timer and
PROGRESS<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Experts,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Recently, I
asked what should happen when an endpoint receives a PROGRESS message indicating
that there are in-band tones and announcements. Should the T310 timer be
stopped? H.225.0 seems to be silent on this, but it would certainly seem
that it should be stopped.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Should we
stop the timer or should the timer continue to run? It will expire in
short order (assuming a default value), which suggests the timer ought to be
terminated and T301 started.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I would
appreciate your input on this.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Paul<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></P></DIV></BODY></HTML>