Multiple CIDs that have the same termination number and business identifier can be grouped together. As each CID can be setup to track calls based on a specific criteria, you can make sure a larger criteria or variation of call sources can be tracked.
For example, CID 10001, 10002 and 10003 are set up each with their own criteria and each with their own set of rolling numbers. If a call is made and the web traffic matches the criteria of CID 10001, a tracking number from the CID 10001 pool will display. If 10001 is not a match, it will cycle to 10002. If 10002 is not a match it will cycle to 10003 and so on.
If the web traffic does not match any of the criteria, it will cycle back to 10001 and display the non-call tracking number pool.
The standard tracking code needs to be slightly altered by adding a "g" after the MID, signifying a CID group follows
<script src="//vxml4.plavxml.com/sited/ref/1000-g-10001-10002-10003" />