This article relates to the Cisco TelePresence MCU 4203, Cisco TelePresence MCU MSE 8420, Cisco TelePresence ISDN GW 3241, Cisco TelePresence ISDN GW MSE 8321, Cisco TelePresence MCU 4505 and Cisco TelePresence MCU MSE 8510 products.
Q. Why does the event log on the Codian MCU / ISDN GW display the error 'Failed to flush cache to external compact flash'?
A. You have set your unit (TelePresence Product) to store CDRs (Call Detail Records), but you haven't put a Compact Flash card in to the external compact flash slot for them to be stored on. (Codian units do not store CDRs internally; they only cache the last few seconds' worth).
To stop this message appearing, go to Events > CDR Log and click Disable.
Alternatively, if you want to keep CDRs, put a 256Mb compact flash card in the external slot and the unit will start using it. You can retrieve the CDR's through the web interface. Go to Events > CDR Log and scroll down to see the Call Detail Record list. You can download the list from the web interface as XML. You can also download CDRs using FTP; however, you cannot copy CDRs directly from the Compact Flash card (using a separate Compact Flash card reader) because they are stored in a custom format.