Some lead tracking systems allow for call source tracking to be done by both Affiliate ID and sub Affiliate IDs. Retreaver also allows Call Source (Publisher) tracking from a given Sub ID (or Sub-Affiliate ID) by tagging numbers with a sub_id.
Adding a sub ID to a static Number
In the left menu, go to the Numbers page and edit the desired Number (or add a new one). Add a sub_id to the number using the Wizard in the Tag list field.
In the wizard, select the Text tab, then select the sub_id Key from the drop-down menu.
Add the Value for the sub_id for your call source being tracked and click Add, then Done.
You will see the new sub_id Tag appear in the list. Once you're finished, hit Update Number.
The sub_id Tag is considered special by Retreaver and will appear on your number and in your call log to help you drill down on data.