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VoIP Phones Random Outage

All of our VoIP phones bounced (re-registered) in the middle of the work day and we do not know why. There is no maintenance going on at this time. The phones came back up right away. Upon further investigation, I only found one error message on our core switch (WS-6509 running IOS ver. 12.2(18)SXF13) and I'm wondering if that was the cause:

Jan  3 13:51:04.030: %SIBYTE-SP-5-SB_OUT_OF_RX_DSCR_CH1: Out of RX descriptors on mac 0 - channel 1 (count: 299)

I cannot find any other instances of this error message from the internet. Can anyone explain this message to me and if it contributed to the phone outage issue? Thanks.

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VoIP Phones Random Outage

Channel 1 of the MAC interface has run out of Rx Buffers.

I'd suggest a TAC case on this one.

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