Lost call on 7920

Hi,
this is the situation in our deployment:
a 7920 phone is configured with line xxxx. Same line xxxx is shared on 7940 phone.
Sometimes a call, routed to line xxxx, ring on 7940 but the 7920 is not alerted at all. So we have only a missed call signaling on 7940 and the call is lost. The 7920 is always in roaming...
Any hint?
Thanks

For 7920, would ensure you are using 3.02.
Also for AP not sure if you are using autonomous or lightweight controller.
If lightweight controller and pre-4.0.217.0, was an issue where 7920 connection to CallManager could get reset as the packets could get aged out within a 1 second period.
The workaround was to set the 802.1p tag for platinum to 7 vs 6. Would suggest to upgrade if possible though.
Also the 7920 sleeps every 2 seconds and doesn't use DTIM to check for queued packets, so could potentially be up to a 2 second delay. Would need to ensure proxy ARP is enabled on the AP with the 7920.
Send more info about your network.

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