Endpoint Group Channel Limitation
By setting your own channel limit on an Endpoint Group, you can control the maximum number of simultaneous calls that can flow through an Endpoint group at any given time. For example, if you set a channel limit of 100 for an Endpoint Group, call attempt 101 will be rejected. This means if you have a combination of 100 inbound and outbound calls active and send our switch an outbound call attempt, our switch will reject that call with a SIP 503 thus failing the call. Similarly, if you had a combination of 100 inbound and outbound active calls and we receive an INVITE from our carrier for a DID assigned to that Endpoint Group, we will send a SIP 503 to our carrier, thus failing the call. The person making that call would hear a fast busy or an operator intercept depending on how their provider reacts to a SIP 503 response.
There are a couple things to be mindful of if you choose to utilize the Channel Limitation feature. As always, if you have the same IP address in multiple Endpoint Groups, our system uses the lowest Group ID number for outbound call attempts. Be careful if you have the same IP address in multiple groups and set a channel limit on the lowest Group ID numbered group thinking you have that IP in other groups so it won't matter--it does so be aware. Conversely, if you set a limit on a higher Group ID with the same IP address as other groups outbound calling from that IP address should not be affected by the limit you set for that group; only inbound calls would be affected in this scenario. When setting a custom channel limit, you are constrained to setting inbound CNAM either ON or OFF for the entire group. You cannot choose to individually set inbound CNAM for specific DIDs; it's all or none if the channel limit is custom set.
To apply a channel limitation, click the Endpoints tab and select Endpoint Group Management. The resulting page will list all of your Endpoint Groups. Click the name of the Endpoint Group you wish to set the limit on. The default setting for every Endpoint Group regarding Channel Limitation is Off. Change the drop-down menu for Status to On. You should now see a text box for entering the desired channel limit. You will also be prompted to turn CNAM on or off. Make your selections and click the Update Channel Limitations button once more. As with any Endpoint Group changes, propagation time (10 to 15 minutes) is required before the change will take effect.
You can remove previously configured Channel Limitations at any time. Simply click the name of the group as before, set the Channel Limitation drop down menu back to Off and click the Update Channel Limitations button.
To enable Channel Limitation, go to Endpoints > Endpoint Group Management:
On the Endpoint Group Management Page, click on the name of the desired Endpoint Group. The Channel Limitations section will be on the top-right. To enable Channel Limitation, change the Status to On, enter the number of channels, then click Update Channel Limitations.
Once you set the status to ON, additional selections will appear. This is where you can enter the exact channel limitation you wish to set, and whether you wish to enable inbound CNAM on this specified Endpoint Group. Please note that because of the way that routing works with channel limitations, CNAM will be activated for either all or none of the DIDs assigned to the group.
Click on Update Limitation to finalize your channel limit, and please allow 10 to 15 minutes for propagation in order for the limit to take effect.