Figure 5: Downloaded Cdr File Sample - Source Channel And Dest Channel 2; Figure 6: Downloaded Cdr File Sample - Source Channel And Dest Channel 3 - Grandstream Networks UCM6100 Series Cdr And Rec Api Manual

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:

Figure 5: 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 6: 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.
There are some other possible values, but these values are almost the application name which are used
by the dialplan.
IAX2/NUM-XXXXXXX: it means this is an IAX call.
Local/@from-internal-XXXXX: it is used internally to do some special feature procedure. We can simply
ignore it.
Hangup: the call is hung up from the dialplan. This indicates there are some errors or it has run into
abnormal cases.
Playback: play some prompts to you, such as 183 response or run into an IVR.
ReadExten: collect numbers from user. It may occur when you input PIN codes or run into DISA
UCM6100 Series CDR and REC API Guide Page 7 of 17