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Issue with latency on WiFi Voice - Symbol Controller, Cisco 7921 handsets

Hi,

We've have a new VoIP implementation with 24 x 7921 Cisco WiFi handests. The wifi controller is a Symbol RFS 6000. The phones register with a call manager on a remote site across a MPLS WAN link. Voice data is on it's own subnet. QoS is configured on LAN and WAN. Phones get their IPs from DHCP

The issue we are seeing is an increasing ping time to the phone. Starts at approx 5ms, graually increases to approx 1500ms, then some packet drops. Then it starts over again, 5ms increaing to 1500 ms.

Configured phones with static IPs but pings keep increasing.
Ping times to Controller from switch are steady.
Ping times to other wifi devices on othe WLANs are steady.
Phones have been registered with another call manager but pings still increase.

ASKER CERTIFIED SOLUTION

Craig Beck

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Hal-itosis

ASKER

WLC Firmware is = 4.2.1.0-005r
Cisco WiFi Phone Firmware = 103.3

Craig Beck

Ok, try connecting the handsets to the network with no security configured. If this sorts the problem, try upgrading the firmware on the handsets.

Hal-itosis

ASKER

Thanks for the input Craig and sorry for the delay in coming back.

We've tested connecting with no encryption but the issue still exists. We will upgrade the firmware tomorrow and test again.

I'll update tomorrow with our findings