<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.2800.1458" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>I thought I would
throw this out there and see if anyone has any ideas...I have the same problem
at 2 locations.</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>The complaint from
the users is that calls "cut out", "kinda like when you have spotty cell
coverage". Doesn't seem to matter whether the call is incoming or outgoing,
although it might be true that my users hear the remote party cut out, while the
remote party doesn't notice the same from my users...</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>Location
1:</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- SDSL 1.5 Mpbs with
static IP, Netopia 4652 SDSL router (enabled "Prioritize Delay Sensitive Data"
to recognize tos=lowdelay per Netopia support)</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005></SPAN><SPAN class=290514004-03052005><FONT
face=Arial size=2>- Dell PowerEdge SC420 with TDM04B (currently only using one
port. the single analog line is call forward on busy to my IAX
provider)</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Asterisk
CVS-v1-0-02/22/05 using IAX to connect to my provider over the public internet -
I have run pings for an extended period of time against my provider's server and
get no packet loss.</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- In IAX.conf:
tos=lowdelay, jitterbuffer=yes, also enabled "Prioritize Delay Sensitive Data"
on the Netopia to support tos=lowdelay per Netopia support</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Average ping time
to my provider: 160 ms with no packet loss</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- 8 Polycom IP-500's
running SIP 1.4.1.0040 and bootrom 2.6.1 using ulaw only</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Small Business
Server 2003 set up as DC for the network</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Two network laser
printers</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- 24 port unmanaged
switch (all phones are home run back to a patch panel, patched from there into a
switch port. The DSL modem, printers and server are patched into the
switch in the same way)</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- 8 pc's running XP
Pro, all plugged into the switch port on the back of the
IP-500's</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>Location
2:</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Full rate data
T1</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Dell PowerEdge
SC1420 with no TDM hardware at all (this location connects SIP directly to the
T1 providers BroadSoft switch and does not go over the public
internet)</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Asterisk 1.0.7 -
using SIP to connect with my provider (not across public internet, not natted
since the Cisco IAD does the SIP mangling for us)</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Average ping time
to the broadsoft switch: 42 ms</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- 8 Polycom IP-500's
running SIP 1.4.1.0040 and bootrom 2.6.1 using ulaw only</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- Small Business
Server 2003 set up as DC for the network</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- One network
printer</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- 24 port unmanaged
switch (all phones are home run back to a patch panel, patched from there into a
switch port. The DSL modem, printers and server are patched into the
switch in the same way)</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>- 8 pc's running XP
Pro, all plugged into the switch port on the back of the
IP-500's</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>As you can see, the
only commonalities are Dell hardware (but not models), Asterisk (but not
versions), IP-500's (including sip and bootrom version), SBS 2003, 24 port
unmanaged switch, the fact that all the pc's are plugged into the switch ports
on the phones.</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>Same symptoms at
both locations. I cannot determine any specific causes (ie it doesn't seem
to be inbound vs. outbound, etc). I have checked all the pc's for viruses
and worms, changed switch ports, etc...the only theory I have right now is that
since the Polycoms give priority to outbound phone traffic vs a connected PC,
that outbound voice is getting the QOS it needs. Versus inbound voice
which gets no priority treatment once it hits either LAN since the switch can't
do any QOS. Am I on the right track with this theory? Do I need to
try a managed switch, giving priority to voice to make sure that both incoming
and outgoing voice packets are preferred? On a side note, at what point
(size - number of clients) is a managed switch recommended?
required?</FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial size=2>If I'm off base with
the QOS theory, what else should I be looking at? </FONT></SPAN></DIV>
<DIV><SPAN class=290514004-03052005><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV> </DIV>
<DIV align=left><FONT face=Arial size=2>Marty</FONT></DIV></BODY></HTML>