[cisco-voip] ICMP to 7965 Phones - Packet loss when pinging from switch?

[Matthew Linsemier]

All,

Today when I was troubleshooting some issues on our LAN I ran across a few
very weird issues in regards to ICMP and both 7965 phones and our UCM
servers.  In my scenario I have a 7965 phone connected to a 3750-PS switch
using the voice VLAN.  When I ping the phone¹s IP from either my Macbook
(OSX) or Windows 7, the phone promptly responds with 0% packet loss and all
is happy.  However, today I tried pining that same phone from our CCM voice
gateway, and for whatever reason it was dropping every 6th packet or so.  I
tried it from our core switch, same results.  Finally, I pinged it directly
from the Cisco 3750 switch and again, had the same results, packet loss.  I
can ping any Windows or OSX server across our network without any loss.
Should the phone be dropping any packets?  I remember reading once that the
UCM servers had built in CSA software that may cause this type of result,
but I wasn¹t sure about the phones.

We don¹t seem to be having anyone complaining about voice calls, and the MOS
scores all look good in the NAM.  I¹m just a bit confused, and I would like
everything on my network to be perfect!

Any input would be greatly apprecaited!

Matt
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