Cisco Call Manager’s main purpose is to route calls from one endpoint to another, usually called the originating device to the destination device. While doing this there are practically an unlimited amount of things that could go wrong. Cisco decided to use what they call a “call termination value” to explain what the issue was. This value is typically numeric, and refers to a preassigned value.
These codes are typically seen in CDRs (Call Detail Records) that are produced by CUCM. CUCM produces CDRs so that they can be read by analytic software (like VoIP Detective), to ultimately produce human readable reports. Read more about Cisco CDRs here.
This means that the cause code was produced by the originating side. The originating side could refer to a phone that started the call, or the gateway that first received an inbound call (among other things).
This means that the cause code was produced by the destination side. The destination side could refer to a phone that received the call, or the gateway that received an outbound call (among other things). An example would be a destCause_value of
Below is the complete list of cause code values, and where appropriate, I’ve given some explanation as to the meaning.