On a 2800 Series router that is configured as a Cisco IOS Voice over IP (VoIP) gateway, an inbound call to the Foreign Exchange Office (FXO) ports fails with no audio. This issue is observed when the caller-id enable command is configured on the FXO ports. Neither party can hear one another and this error is shown on the debug level:
This issue is documented in Cisco bug ID CSCse56660. The only possible workaround for this Cisco IOS software release is to disable Caller ID on the FXO ports.
In order to resolve this issue, upgrade the Cisco IOS software release as mentioned in the First Fixed-in Version 12.4(4)XC03, 12.4(07b), 12.4(08a), 12.4(9.17), 12.4(03f), 12.4(10.1)T, 12.4(9)T01, 12.4(6)T04, 12.4(4)T05.
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