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<DIV dir=ltr align=left><SPAN class=253370614-10102008><FONT face=Arial
color=#0000ff size=2>What is the RTT between the gateway and the CCM? If
you are doing H.323 slow start then the H.245 negotiation is probably what is
slowing you down. I'd start by enabling fast-start inbound on the gateway
page in CCMAdmin and going from there. The router should try fast-start by
default.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=253370614-10102008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=253370614-10102008><FONT face=Arial
color=#0000ff size=2>If it's not the media negotiation causing this then you
need to do some digging into debugs at the router and CCM traces. Compare
when CCM sends the StartMediaTransmission to the phone versus when the phone
starts to send audio. Do the same for when the phone sends
the OpenReceiveChannelAck to CCM and when it starts to receive audio. A packet
capture at the phone will help with this.</FONT></SPAN></DIV>
<DIV> </DIV><!-- Converted from text/plain format -->
<P><FONT size=2>-Ryan </FONT></P>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] <B>On Behalf Of </B>Djokic
Sinisa<BR><B>Sent:</B> Friday, October 10, 2008 2:12 AM<BR><B>To:</B> 'cisco
voip'<BR><B>Subject:</B> [cisco-voip] CCM 4.1(3) audio delay
!!!<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">hi
group..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">does anybody has an idea what could
be the cause of the following problem..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">we have a CCM4.1(3) cluster with 2x
2851 as a h323 gateways..the phones are 7912, 7940, 7960 and
7970..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">the problem is as
follows..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">when external caller makes a call to
IP phone inside a CCM cluster the call comes over PSTN and
PRI..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">the IP phone rings, somebody answers
the phone..caller starts to talk immedialtely..for first 2-3 seconds person on
the IP phone cannot hear anything, and after that interval everything is
fine..no conversation is lost..just for first 2-3 seconds it looks like
conversation is delayed but not lost, and afterwards everything is
fine..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">in opposite
direction..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">when IP phone makes a call to some
external number over the PSTN and PRI..external phone rings..somebody answers..
caller starts to talk immedialtely.. external phone can hear a caller from IP
phone side but have lost first 2-3 seconds of conversation..afterwards
everything is fine..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">ther is no firewall between any of
the devices, everything is clear..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">any
ideas?..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">thanx..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">regards..<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><STRONG><B><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Sinisa
Djokic</SPAN></FONT></B></STRONG><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"> </SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">System
Engineer</SPAN></FONT><BR><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">CCNP,CCDA,CQS-CWLDS,CS-CIPTDS,CS-CIPCCES
Cisco Certified</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P>
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style="FONT-SIZE: 12pt"><IMG id=_x0000_i1025 height=94
src="cid:253370614@10102008-067F" width=60
border=0><o:p></o:p></SPAN></FONT></P></TD>
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<P class=MsoNormal><FONT face=Verdana size=1><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: Verdana">MDS Informaticki
inzenjering</SPAN></FONT><BR><FONT face=Verdana size=1><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: Verdana">Bul. Arsenija Carnojevica
170</SPAN></FONT><BR><FONT face=Verdana size=1><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: Verdana">11070 Novi <st1:place
w:st="on"><st1:City w:st="on">Beograd</st1:City>, <st1:country-region
w:st="on">Serbia</st1:country-region></st1:place></SPAN></FONT><BR><FONT
face=Verdana size=1><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: Verdana">Tel: +381 11 2015 200, 2015
273</SPAN></FONT><BR><FONT face=Verdana size=1><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: Verdana">Fax: +381 11 3194
954</SPAN></FONT><BR><FONT face=Arial size=1><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: Arial"><A
href="http://www.mds.rs">www.mds.rs</A></SPAN></FONT><BR><FONT face=Arial
size=1><SPAN style="FONT-SIZE: 7.5pt; FONT-FAMILY: Arial"><A
href="mailto:sdjokic@mds.rs">sdjokic@mds.rs</A></SPAN></FONT><o:p></o:p></P></TD></TR></TBODY></TABLE>
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