What are Tandem Calls? They show up in ART and im not sure what they represent...
The way I understand it is :-
If you have a line that has a forward set to a destination external from Callmanager - then this shows up as a Tandem Call.
For instance we have a Callmanager Line '201' that is set up to call forward all to a Fax machine on a dedicated analogue line. The ART statistics for line '201' always show up as Tandem.
I guess that the term tandem comes from the idea that a call that should take up one line actually takes up two - but that's just my guess.
This is interesting because we actually prevent forwarding offnet. I do have FXS ports on my gateway... I use these for fax machines. I wonder if it counts these as tandem...
I understand that the calls Tandem are called originated from remote gateway to other remote gateway that use the CallManager as intermediate point between origin and destiny.
Well in my situation I have only one gateway routing calls onto the PSTN...