We have a Cisco3845 router that acts as a VoIP gateway that is, it converts TDM traffic from the Public Switched Telephone Network (PSTN) into H.323 traffic. My problem is that we would like to know how many calls are going through the gateway and represent this information in diagram format by using Cacti, for example. But I can't seem to find an OID that is responsible for this kind of data. In fact, I have found a few OIDs but SNMP Object Navigator (cisco.com) says that I can't retrieve their entries because they have the status "Permission: not-accessible". If someone knows how to approach this problem or have any suggestions, your help will be greatly appreciated. Thanks.