We are Cisco VoIP across our network and I am being asked to monitor the PRIs going into our routers. I have played with some of the Pollers to show active calls etc already. I am looking for way to guage the health of the PRIs. I am using IP SLA manager to show MOS, jitter etc, but what about wathcing the physical layer? How do I monitor for errors on the PRI itself? Keep in mind I am primarily a data person and am just getting into the voice side. Will monitoring the D channel (serial x/x/x:23) accurately show errors if the PRI is taking errors? Are there other custom pollers I can use to look at the physical circuit from the routers perspective? We are running 2821, 3825 and 7201s for voice gateways.