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Cisco SIP Phones FCS error

Hi guys

Can somebody help us?

We have

100x 9951 (sip)

400x 69xx (sccp)

UCM 9.1.2

The 9951 sip are flapping between UCM. We idenfied timeout between phones/ucm.

After sniffer the network, we identified big number retransmission of packets (from sip phones) and a big number of FCS error.

IN sccp, we dont received error, so we migrate 1 phone sccp to sip and the result.....also problem, a big number of fcs and restransmission

1 REPLY

Cisco SIP Phones FCS error

Have a look at the FW load of the phone, please see below:

https://tools.cisco.com/bugsearch/bug/CSCtv09841

Voice CCIE #37771
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