[asterisk-users] Trying to use "Set Group" correctly

Sorry if this is a repost, but I never saw this appear on the mailing list (I originally sent it 5 days ago)

Hi,

 

A while ago I inquired about controlling the number of channels used by each of my customers, and I was told to use the Set Group command  to count the number of used channels .  I did, and at first glance it seemed to work.

 

Now, the thing is my original plan was to only increment the count everytime someone made  an external call.  In other words, a call from inside to outside counts for 1, a call from outside to inside counts for 1 and a call from inside to inside counts for 0.  Allowing me to sell me service on a "per-external-line basis".

 

Now, what I noticed is that a call coming in counts for 1.  But if the person, who is first sent to an IVR, eventually dials an extension and rings a SIP phone, the count is incremented again (to 2 at this point).  Which is not that I want. 

 

How can I make sure that only the "external leg" is counted?

 

 

Mike