Enable SNMP on your Cisco Routers to watch SIP and other traffic

It’s pretty easy, just ssh (or telnet if you’re crazy) to your router and do this:

# en
# conf t
# snmp-server community YOUR.SNMP.COMMUNITY ro
# access-list 60 permit IP.OF.SNMP.DAEMON
# snmp-server host IP.OF.SNMP.DAEMON YOUR.SNMP.COMMUNITY
# snmp-server enable traps

Now your favourite graphing software should be able to collect all the data you need.