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New Member

Lost call on 7920


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?


Cisco Employee

Re: Lost call on 7920

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-, 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.