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Introduction

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As mentioned, two applications need to be used to count channels.  Probably the easiest way to do this is in the Dialplan entries that “Dial the trunk”.  Let's assume you have an entry in your  Dialplan to dial National numbers in the USA. So, for example, 1 followed by 10 digits.  With the following Dialplan you can count all concurrent calls that dialed a national number: 

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1. Custom application -> Set(GROUP()=TrunkOUT) - here we are marking this channel (call) with the label “TrunkOut”.  This is simply done so that we can then use the Group Count application next
2. Set -> Tags -> calls:${GROUP_COUNT(TrunkOUT)} -  here we are setting a Tag (so you can see the result in cdrview) with the concurrent calls count.  For this, we use the function “${GROUP_COUNT(TrunkOUT)}”. Please notice that we pass as argument to this application which is the label “TrunkOUT”.  What this will do is check all active channels (active calls) and count those marked as “TrunkOUT”. Thus it produces a count of concurrent calls that are “grouped” into the TrunkOUT group
3. Dial the trunk -> select a trunk - just dial the trunk as you would normally do.

Once the 2 mentioned applications are added to the Dialplan, the following is what you will see in CDR-View: 

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In the previous picture, the first 3 calls were concurrent (all 3 were active at the same time).  And you can see in the tags that every new call made increased the count.

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For inbound calls we also need to use the above mentioned applications.  Most likely the best place to put such applications is in your "main" Dialplan procedure (default Dialplan for inbound calls).  So, let's assume that your trunk has 10 DIDs and that you want to count ALL incoming calls. You would need to put something like the following in every DID entry: 

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1. Custom application -> Set(GROUP()=TrunkIN) - here we are marking this channel (call) with the label “TrunkIN”
2. Set -> Tags -> calls:${GROUP_COUNT(TrunkIN)} - here we are setting a Tag (so you can see the result in cdrview) with the concurrent calls count. For that we use the function “${GROUP_COUNT(TrunkIN)}”
3. Dial the phone -> Number 108 - Just dial the phone (or anything you wish to do for this DID) as you would normally do.

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Once the 2 mentioned applications are added to the dial plan for inbound calls, the following is what you will see in CDR-View: 

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In the previous picture, the first 3 calls were concurrent (all 3 were active at the same time) and you can see in tags that every new incoming call made increased the count.

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In the Dialplans below, inbound and outbound calls are all grouped together.  This results in a tag that will tell you a total concurrent count on the trunk being used.  You see that this is accomplished simply by using the same label in both inbound and outbound calls. So for instance, just use Trunk instead of TrunkOUT and TrunkIN.  Example below:

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When the same label is used for both inbound and outbound calls, CDR-View will look like this: 

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In the previous picture only the first 2 calls are inbound and the third one was outbound. Notice however that all 3 of them were active concurrently and  were counted together.

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When assigning a label to channels, please make sure the label is not used anywhere else (Call group names, Trunk names, Dialplans names  and so on). Otherwise, it could lead to incorrect counting.

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