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BCM i2004 packet loss

BCM i2004 packet loss

BCM i2004 packet loss

(OP)
Question for the group:
   Anyone out there having unexplained packet loss on LAN-attached i2004's in conjunction with 3.5 or 3.6 and Baystack 460T-PWR's? Am currently working two different cases of trouble with the above scenario. In both cases, the reports of packet loss are prevalent mostly with 4 digit calls between i2004 stations (both are on same subnet and connected to same Baystack).
   We have QOS enabled on the BS460, and are  using autonegotiate for all of the access ports and the port attached to the BCM. We Have VLANs correctly configured to separate VOIP and PC traffic. All station cabling has been tested and certified to 100Mbps/CAT5. Ethernet stats/errors on the BS-460T's are fine. BS-460T's have been changed out and upgraded to latest release. BCM has latest PEP's.
   At both of these sites, the phones work great 99 percent of the time, but at different times of the day, all phones have registered packet loss complaints at one time or another. I have a ticket open with Nortel, but they haven't been able to pin this down. I know that this sounds like a network issue, but stress testing with Net Chariot has revealed that the network infrastructure is rock solid.

   Anyone have any ideas or is anyone else experiencing this with this mix of equipment?
   In both

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