Figure 134: Downloaded Cdr File Sample - Source Channel And Dest Channel 1; Figure 135: Downloaded Cdr File Sample - Source Channel And Dest Channel 2; Figure 136: Downloaded Cdr File Sample - Source Channel And Dest Channel 3 - Grandstream Networks UCM6510 IP PBX User Manual

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 134: Downloaded CDR File Sample - Source Channel and Dest Channel 1

DAHDI means it is an analog call, FXO or FXS.
For UCM6510, DAHDI/(1-2) are FXO ports, and DAHDI(3-4) are FXS ports.
For UCM6510, DAHDI/(1-4) are FXO ports, and DAHDI(5-6) are FXS ports.
For UCM6510, DAHDI/(1-8) are FXO ports, and DAHDI(9-10) are FXS ports.
For UCM6510, DAHDI/(1-16) are FXO ports, and DAHDI/(17-18) are FXS ports.
Sample 2:

Figure 135: Downloaded CDR File Sample - Source Channel and Dest Channel 2

"SIP" means it's a SIP call. There are three possible format:
(a) SIP/NUM-XXXXXX, where NUM is the local SIP extension number. The last XXXXX is a random string
and can be ignored.
(c) SIP/trunk_X/NUM, where trunk_X is the internal trunk name, and NUM is the number to dial out
through the trunk.
(c) SIP/trunk_X-XXXXXX, where trunk_X is the internal trunk name and it is an inbound call from this
trunk. The last XXXXX is a random string and can be ignored.
Sample 3:

Figure 136: Downloaded CDR File Sample - Source Channel and Dest Channel 3

This is a very special channel name. If it shows up, most likely it means a conference call.
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