Grandstream Networks UCM6510 - Cdr Csv File; Figure 3: Downloaded CDR File Sample - Call to Shows S; Figure 4: Downloaded CDR File Sample - Source Channel and Dest Channel 1

UCM6510 CDR Report and CDR API Guide
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CDR CSV FILE
The downloaded CDR .csv file has different format from the web UI CDR. Here are some descriptions.
 Call From, Call To
"Call From": the caller ID.
"Call To": the callee ID.
If "Call From" shows empty, "Call To" shows "s" (see highlight part in the picture below) and the "Source
Channel" contains "DAHDI", this means the call is from FXO/PSTN line. For FXO/PSTN line, we only
know there is an incoming request when there is incoming call but we don't know the number being called.
So we are using "s" to match it where "s" means "start".
Figure 3: Downloaded CDR File Sample - Call To Shows "s"
 Context
There are different context values that might show up in the downloaded CDR file. The actual value can
vary case by case. Here are some sample values and their descriptions.
from-internal: internal extension makes outbound calls.
ext-did-XXXXX: inbound calls. It starts with "ext-did", and "XXXXX" content varies case by case, which
also relate to the order when the trunk is created.
ext-local: internal calls between local extensions.
 Source Channel, Dest Channel
Sample 1:
Figure 4: Downloaded CDR File Sample - Source Channel and Dest Channel 1
DAHDI means it is an analog call, FXO or FXS. DAHDI/(1-2) are FXO ports, and DAHDI(3-4) are FXS