We monitor the up/down status of PRI's with NPM by monitoring the D channel of the PRI. (Channel 23:Signaling). Beginning with the implementation of Cisco IOS 16.6.3 on routers, we see that that channel has disappeared from being discovered by NPM. We now see only the 24 voice channels. Doing an SNMP walk of the MIB confirmed this.
Have others noticed this? How are others monitoring the up/down status of PRI's using NPM? I was thinking that possibly monitoring channel 23 would accomplish up/down monitoring, but if this is truly only the voice portion of the circuit, it won't work. Appreciate any input others have.