Cisco ubr7246vxr with packetcable

We are running a Cisco ubr7246vxr with Arris cable modems and PromptLink for our provisioning system. We recently rolled out voice over this cable system. I am looking to track the number of voice calls that are up at any given time. I use the "show packetcable gate summary" command. I also use a product called PRTG to graph a bunch of items in our network. What I would like to find and am unable to so far is the OID to track the packetcable gate summary information. I would like PRTG to graph the number of phone calls that are up and active at any given moment. Anybody have this OID or know where I can find it. Does anybody else track this type of information? Also I have been told to track the T3 and T4 information on the modems. Does anybody track this and have the OID's for this traffic. Thanks much!