Figure 117: Downloaded Cdr File Sample - Call To Shows "S; Figure 118: Downloaded Cdr File Sample - Source Channel And Dest Channel 1 - Grandstream Networks UCM6102 User Manual

"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".

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 118: Downloaded CDR File Sample - Source Channel and Dest Channel 1

DAHDI means it is an analog call, FXO or FXS.
For UCM6102, DAHDI/(1-2) are FXO ports, and DAHDI(3-4) are FXS ports.
For UCM6104, DAHDI/(1-4) are FXO ports, and DAHDI(5-6) are FXS ports.
For UCM6108, DAHDI/(1-8) are FXO ports, and DAHDI(9-10) are FXS ports.
For UCM6116, DAHDI/(1-16) are FXO ports, and DAHDI/(17-18) are FXS ports.
Sample 2:
Firmware Version 1.0.7.11

Figure 117: Downloaded CDR File Sample - Call To Shows "s"

UCM6100 Series IP PBX User Manual Page 212 of 233