Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

7.Update.

Result: Call Detail Records will start logging immediately.

Caution: Tracing voice connectivity requires that CDR logging be enabled on every Cisco CallManager installation in a cluster.

CDRs

CDRs provide basic information that can help you understand the more detailed information contained in SDI traces. Basic CDRs provide information such as the calling number, called number, originating IP address, destination IP address, call duration, and so on. CDRs can help you troubleshoot phone problems. For example, if a user reports a problem with a call occurring at a specific time, you can consult the CDRs that occurred around the time indicated to learn additional information about that call and others. CDRs are commonly used for billing.

Diagnostic CDRs (Also Known As CMRs)

Diagnostic CDRs provide detailed call information, such as the number of packets sent, received, and lost, the amount of jitter and latency, and so on. This level of detail can provide explanations for some problems, such as one-way audio. For example, a one-way audio problem is indicated if a packet size of 10,000 is sent, but the received size is only 10.

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Cisco Systems 30 VIP manual CDRs

30 VIP specifications

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